# scan 0.68.1

- Introduced rlang error and messaging system for more informative error messages and warnings.

# scan 0.68.0

## New features

- Reworked `fill_missing()` function. It now interpolates the values for all variables in an scdf.

## Shinyscan app

- Introduced tabset in the data load and example data tab.
- Tabsets in the plot dataset with many added options.
- Tabsets in the stats tab with Arguments on a separate tab.

## Corrections

- Extended roxygen helpfiles for many functions.

## Fix

- export function for `plm()` does not throw an error when AIC can not be computed.

## New example datasets

- example_stranger: example for screen time of Stranger Things characters.
- example_atd: three case example for AB alternating treatment design.

# scan 0.67.0

## Reworked Shiny Scan app

- Complete new design for the "plot" tab.

## New features

- `shinyscan()`: New argument theme (default is `cerulean`) that allows to run shinyscan in a different bootstrap 5 theme.
  I like `shinyscan(theme = "united")`
- `export()` methods for: `cdc()`, `corrected_tau()`, `rand_test()`, `ird()`, `outlier()`, `autocorr()`.

# scan 0.66.0

## New features

- `as_scdf()`: Add format checks with informative error messages.  
  (Mainly useful for externally loaded files via `read_scdf()`.)
- `shinyscan()`: New argument `browser`. Default `"external"` launches the Shiny app in an external browser.
- `between_smd()`:  
  - Stops if the `scdf` contains only one case.  
  - Redesigned outputs.  
  - Improved Bayesian analysis.  
  - Added confidence/credible intervals and new argument `ci`.
- `hplm()`: 
  - Argument `ar` sets a auto-regression parameter for correlated residuals.
  - Argument `unequal_variances` weights the estimations by within phase variances.

## New shiny app for importing data

- `import_scdf()`: opens a small import menu. Also available as an addin in R Studio.

## Reworked Shiny Scan app

- Redesign the “Add case” workflow.
- Added an import procedure to choose variable names at import.
- Now it is possible to start shinyscan with an scdf object and directly start to analyse it `shinyscan(exampleABC)`.
- Stats tab: auto-fill the “Output arguments” field when a statistics function is selected.
- Stats tab/ Settings tab: "Description" switch in settings can be set to provide additional short descriptions for each stats function.
- Switch to Bootstrap 5.
- Miscellaneous visual polish.

## Error correction

- Addin in R-Studio is now renames to "Lauch Shiny-Scan" and finally works.

# scan 0.65.1

## Error correction

- `plm()`: dummy slope values did falsely ignore missing values. That could lead to incorrect slope effect estimations.

# scan 0.65.0

## New function

- `rowwise()`: A new helper function for `transform()` that allows to make calculations rowwise:

```.r
ex <- exampleAB_add; ex[[1]]$wellbeing[c(3, 6)] <- NA
transform(
  ex, 
  mean_dv = rowwise(mean(c(wellbeing, cigarrets, depression), na.rm = TRUE))
)
```

## New features

- `mplm()`: Reworked the function and its output. Now provides global F test and a more integrated depiction of the coefficients. Added export() method.
- `plm()/print.sc_plm()`: either print partial or delta (incremental), or both R squared: 

```r
plm(exampleAB$Johanna) |> 
  print(r_squared = c("delta", "partial"))
```

## Corrections

- `plm()`: Corrected calculation for model fit F statistic and R2 for models without an intercept
- `scdf()`: Reported a false error message when the `phase.start` argument was used and mt started with 0.

## Further changes

- `scdf()`: Optimized code, function arguments, and help page.

# scan 0.64.0

## New functions

- `fetch()`: General getter function to extract components from a scan object. It takes a scan object and and an optional argument and returns sub-objects. 
For now, it extracts the regression object of class glm, lm, lme from the respective plm, hplm, and mplm objects:

```r
mod <- plm(exampleAB$Johanna)
fetch(mod)
```

## New features

- `anova()`: Implemented functionality of further arguments of the generic anova functions.
- `options(scan.string.dummy.phase = "phase")`: can be renamed to avoid name conflicts in the output of regression models.
- `options(scan.string.dummy.slope = "inter")`: can be renamed to avoid name conflicts in the output of regression models.

# scan 0.63.0

## New functions

- `bplm()`: Bayesian piecewise regression model. Applies a Markov Chain Monte Carlo sampler from the MCMCglmm package. With export method.
- `add_dummy_variables()`: Helper function that adds dummy variables necessary to calculate a plm to an scdf. 
- `anova.plm() anova.hplm()`: Methods for likelihood ratio model comparison.

## New features

- `hplm()`: Adds inter correlation of random variables to the print output.
- new option: `scan.rename.predictors` can be set to `no`, `concise`, or `full`. Changes how predictors of regression models are renamed.
- `between_smd()`: Added support for Bayesian regressions `model = "bayesian"` or providing an object returned from the `bplm()` function.

## Solved bugs

- `plm()`: setting `var_trials` to a constant threw an error.

## Corrections / Changes

- `between_smd()`: Reworked the function output to avoid confusion. A 'pure' between case smd estimation is provided when the argument `include_residuals = FALSE` is set.
- `print.sc_plm() / export.sc_plm()`: New argument `ci` for specifying a confidence interval. Either `FALSE`, `TRUE` or a number between 0 and 1 (0.90 for a 90% intervals).

# scan 0.62.0

## New functions / features

- `rescale()`: New function as a helper for getting standardized estimators in regression models. e.g. `exampleAB |> rescale() |> hplm()`.
- `between_smd()`: Calculates between case standardized mean differences as proposed by Pustejovsky et. aL (2014). Can take complex hplm models as a basis.
- `na.omit.scdf()`: scdf method for generic `na.omit()`. Removes any row with a missing value from an scdf.

## New features

- `design()`: Argument `random_start_values` randomly assigns start values for each case based on the distribution (`normal`, `poisson` or `binomial`) and the respective parameters (`start_values`, `s`, `n_trials`).
- `print.sc_hplm()`: New argument `smd`. If set TRUE, between case smd results are reported.
- `tau_u()`: New method `"tarlow"` calculates Tau-U as implemented in an R code and online calculator by Tarlow (2017). Here, tau values are calculated as in the `method = "complete", continuity_correction = TRUE, tau_method = "a"`. Inferential statistics are calculated based on tau b and the standard deviation for S is derived directly from Kendall's Tau B analysis (different from the `parker` and `complete` methods). 
- `rand_test()`: It is now possible to provide new functions for calculating the statistic directly with a list to the `statistic_function` argument. This list must have an element named `statistic` with a function that takes two arguments `a` and `b` and returns a single numeric value. A second element of the list is named `aggregate` which takes a function with one numeric argument that returns a numeric argument. This function is used to aggregate the values of a multiple case design. If you do not provide this element, it uses the default `function(x) sum(x)/length(x)`. The third optional argument is `name` which provides a name for your user function.

```r
userstat <- list(
  statistic = function(a, b) median(b) - median(a), 
  aggregate = function(x) median(x),
  name = "median B - A"
)

rand_test(exampleAB, statistic_function = userstat , complete = TRUE)

# which is identical to:
rand_test(exampleAB, statistic = "Median B-A" , complete = TRUE)
```

- `rand_test()`: Returns startpoints for the random permutations.
- `plot_rand()`: New argument `type` when `"xy"` a plot with splitpoints and statistics is drawn. This allows to see graphically at which measurement time a statistic changes.

```r
Leidig2018[4] |> 
  na.omit() |> 
  rand_test(complete = TRUE, limit = 1, statistic = "SMD glass") |> 
  plot_rand(type = "xy")
```


## Corrections / Changes 

- `scdf()`: Throws an error when argument `phase_starts` is set and the beginning of the first phase is not the first measurement.
- `tau_u()`: Method `"parker"` ignores the `tau_method` setting and sets `continuity_correction = FALSE`. This follows the Parker (2011) paper. There, the inferential statistics are calculated using Kendall's Tau b while the actual Tau calculation applies Kendall's Tau a (without ties).
- `rand_test()`: Missing values in the dependent variable are now removed before calculations.

## Solved bugs

# scan 0.61.0

## Solved bugs

- Corrected the name of the level-effect predictor for regressions when the phase variable is not named "phase".

## New

- Tip-of-the-day like message at start-up.
- Multiple improvements of the Shiny app (try out with `shinyscan()`)
- new output engine for rendering html export based on *gt table*. Set `options(scan.export.engine = "gt")`. This engine allows to export tables into docx format: `overlap(exampleAB) |> export(file = "test.docx", flip = TRUE)`.
- new export functions for `pem()`, `pet()`, `pnd()`, and `summary()` (either `summary(exampleAB) |> export()` or `export(exampleAB, summary = TRUE)`)

## Changes

- `rci()`: removed the Hageman et al. method as it is not appropriate for single-cases in the current implementation.
- `scdf()`: New argument `phase_starts()`. Which defines the measurement times of the start of each phase. `phase_starts = list(A = 1, B = 10, C = 15)`. It throws an error when a phase start is defined where no corresponding measurement-time exists. `phase_starts` is a generalization of `B_start`.
- `rand_test()`: New option for `statistic`: `SMD` calculates the standardized mean difference as Hedge's g with Durlak correction. `W-test` computes Wilcoxon tests and compares average W statistics. `T-test` computes T-tests and compares average t-Values. `NAP` and `NAP decreasing` for Non-overlap of all pairs.
- `nap()`: added Cohen's d and R-Squared effects.
- `export()`: `select` argument for `nap`
- `coef.sc_hplm()`: new `casewise` argument. If set TRUE, returns the effect estimations casewise.
- `print.sc_hplm()`: new `casewise` argument. If set TRUE, returns the effect estimations casewise.
- `export.sc_hplm()`: new `casewise` argument. If set TRUE, returns the effect estimations casewise.
- `export.scdf()`: new `summary` argument. If TRUE, returns a summary.
- `hplm()`: new arguments `random_trend`, `random_level`, and `random_slope` to selectively add respective random slope effects to the model.

## New examples

- `Parker2009b`

# scan 0.60.0

## New function

- `ird()`: Robust improvement rate difference as formulated by Postejovski (2019).

## Changes

- `pand()`: Rewrote function. New argument `method` allows to apply the sorting algorithm proposed in Parker 2007 and `method = "minimum"` applies the exact method provided by Pustejovski in 2019. Furthermore, the tau test was replaced with a X Squared and a Fisher exact test.
- `corrected_tau`: Report results with warning when all phase A data are identical; new argument tau_method = "a" to switch to Kendall's tau-a.
- `export()`: new for `pand()`.
- New example datasets: Tarlow2017, Parker2011b, Parker2009, Parker2007

## Shiny scan

- Added power-analyses
- Added settings
- Extended save options
- Various changes and optimization of the ui

# scan 0.59.0

- `describe()`: now works correctly for duplicated phase names.
- shiny-app no longer depends on `shinyjs` and `markdown`. `shinyscan()` asks if missing packages `scplot` and `shiny` should be installed automatically. 

# scan 0.58

## Shiny app added

- start the app with `shinyscan()`
- you need the following packages to run the app:
  - `shiny`, `shinyjs`, `scplot`, `markdown`

## New fucntions

- `batch_apply()`: Apply a function to each element in an scdf. Use `.` as a placeholder for the scdf case.

```r
batch_apply(exampleAB, plm(.) |> coef())
```

- Helper functions for `transform()`: `n()`, `all_cases()`, `across_cases()`, `first_of`
- Helper functions for `transform()`: `moving_mean()`, `moving_median()`, `local_regression()`
- `corrected_tau()`: returns multiple cases
- `export()`: new for `nap(), pen()`
- `c()/combine()`: new arguments to set author and info attributes of the resulting scdf (`author`, `info`)

## Changes in functions

- `plm()`: Print function allows to set maximum lag for autocorrelations; Overall significance Ljung_Box test is reported.

```r
plm(exampleAB$Johanna) |> print(lag_max = 5)
```

## Bug fixes

- solved: `summary()` failed when one of the cases had no name
- solved: `nap()` only reported values for the first case with multiple cases.
- solved: `add_l2()` lost column name of l2 variable when l2 had only one variable.

## minor

- `convert()`: new arguments. indent sets the indentation. When the scdf contains only one case, no study is combined.
- `select_phases()`: New argument `phase_names` sets names of the recombined phases. The default `"auto"` creates combinations of the phase names automatically (e.g., `A = c("A", "B", B = "C")` results in phases `AB` and `C`).

# scan 0.56

## New features

- `export()`: New export for `power_test()` and `smd()` output.
- `export()`: `tau_u()` export with new argument `case` which takes the values `"meta"` or `"all"` and new argument `select` allowing to select, reorder, and rename specific variables.

- `select_cases()`: Allow for a selection based on object names (like in substitute).

```r
select_cases(exampleAB, -c(Johanna, Karolina))
select_cases(exampleAB, Johanna, Karolina)
v <- c("Moritz", "Jannis")
select_cases(exampleA1B1A2B2, v)
```

- `plm()`, `hplm()`: New arguments `contrast_level` and `contrast_slope` allow for setting the contrasts for level and slope separately. Both elements can either be "first" or "preceding".
- Speed-up `tau_u()` by 20%.
- rewrote `as_scdf()`, `read_scdf()`. Now it is easier to import data from any file format.

``` {.r}
readODS::read_ods("filename.ods") |> as.scdf()
openxlsx::read.xlsx("filename.xlsx") |> as.scdf()


readODS::read_ods("filename.ods") |> 
  as.scdf(
    cvar = "id", 
    pvar = "section", 
    mvar = "day", 
    phase_names = c("baseline", "intervention")
  )
  
as.data.frame(exampleABC) |> readODS::write_ods("filename.xlsx")
as.data.frame(exampleABC) |> openxlsx::write.xlsx("filename.xlsx")
```

## Bug fixes

- `tau_u()`: Rewrote the calculation of meta analyses and confidence intervals.
- `tau_u(), correted_tau()`: corrected a wrong calculation of the continuity correction when values where lower in phase B.
- `tau_u()`: Implemented a new method for calculating confidence intervals based on Fisher-Z transformations (see Long, J. D., & Cliff, N. (1997). Confidence intervals for Kendall’s tau. British Journal of Mathematical and Statistical Psychology, 50(1), 31-41.

## superseded function

- `smooth_caes()`, `shift()`, `standardise()`, `ranks()`, `truncate_phases()`: All superseded by `transform()` and its helper functions. See details in the help files of transform and in the scan-book.

## minor changes

- `as.data.frane.scdf()`/`as_scdf()`: keep and retrieve scdf attributes.

# scan 0.55

## new functions

- `coef()/ coefficients()`: Method for base R `coef` function for plm/hplm objects. Extracts coefficient tables from provided object.

```.r
coef(plm(exampleAB$Johanna))
```

## New features

- `power_test()`: New argument `ci` provides confidence intervals for power, alpha error, and correct proportions. New arguments `binom_test_alpha, binom_test_power, binom_test_correct` provide test against a provided proportion for alpha, power, and correct proportions.

```.r
design <- design(
  n = 1, phase_design = list(A = 6, B = 9),
  rtt = 0.8, level = 1.0, trend = 0.05
)

power_test(
  design, ci = 0.95, binom_test = TRUE
)
```

- `plm()`, `hplm()`: Added contrast argument with values `"first"` or "`preceding`". Now `model = "JW"` is deprecated and identical to `model = "B&L-B", contrast = "preceding"`.  
- `plm()`, `hplm()`: Added model `"W"`. Which shifts the measurement-time variable to start with zero. This leads to a more sensible estimation of the intercept (where the intercept depicts the estimated score at the start). `model = "W"` is now the default. Use `model = "B&L-B"` for previous defaults.

## Bug fixes

- solved #66: `set_vars()` working.
- `read_scdf()` now works when cvar is not the first column.

## Changes to functions

- `corrected_tau()`: changed default setting of arguments to: `repeated = FALSE, continuity = FALSE`. Now the default results match the calculator developed by Tarlow.

- `tau_u()`: Implemented a continuity_correction (S-1 for calculating Z)

# scan 0.54.1

## Bug fixes

- `select_phases()` now works when phase variable is not "phase"
- `estimate_design()` was broken and is fixed now.
- `print()` function for `sc_design`fixed.

# scan 0.54

## new functions

- `transform()`: Takes an scdf and calculates or modifies variables 
for each case (`transform(exampleAB, z_values = scale(values), t_values = 50 + z_values * 10)`).
- `smd()` reporting various types of standardized mean differences.

## reanmed functions (old functionnames still work)

- `readSC()` -> `read_scdf()` 
- `writeSC()` -> `write_scdf()`
- `design_rSC()` -> `design()`
- `rSC()` -> `random_scdf()`

## Complete rework - as new

- `power_test()` with various extensions, optimizations, and solved various bugs. rewrote the `print` method, added an argument `duration` to print the computation duration. Added the `'n_trials'` argument for binomial distributions. Extended the help page.  
- `design()` and its print method. Extended the help page. Rewrote the algorithm for the 'binomial' distribution.  

## Extended functions

- `plm()`: rewrote the analysis function for binomial tests. These now need an argument `var_trials` to define the number of trials per measurement. The  `dvar_percentage` argument must be set TRUE when the dependent variables are percentages (and `family = 'binomal'`).
- speed optimized `random_scdf()`. Rewrote the algorithm for 'poisson' distributed measures. Rewrote the algorithm for the 'binomial' distribution. Extended the help page.  
- `read_scdf()`: extracts filetype from file extension.
- `read_scdf()`: New `yaml` import options for scdf files

```yml
Anna:
  values:
    A: [1, 3, 4, 5, 6, 7]
    B: [8, 9, 10, 10, 11]

Toni:
  values:
    A: [2, 3, 4, 5, 6, 7]
    B: [3, 9, 10, 10,11]
  control_var: [1,2,3,4,5,6,7,8,1,2,3]
```

- `tau_u()` #51: Added option for confidence intervals for tau_u output.

## Solved error in functions

- `describe()`: solved wrong calculation of Hedges G when phase length differed.
- `plm()` solved #46: throws no error, when a phase is of length 1.
- `corrected_tau()` solved #48: throws warning when A phase has less than three rows.
- solved #49: changes class from tibble to data.frame within scdf.

# scan 0.53

## Major changes

- scdf files now allow to combine studies with different phase designs.
Several functions have been adapted to handle cases with differing designs in a mutual analysis.
- The `%>%` operator has been imported and exported from the magrittr package. Now that R 4.1 has a
pipe operator, pipes seem to become the standard. For compatibility with older R Versions, we will stay with the `%>%` operator for some time before switching to `|>`.
- To allow for a piping code, we added several functions: `add_l2, select_phases, select_cases, subset, set_vars, set_dvar, set_mvar, set_pvar`.

### New functions

- `sample_names()`: Returns a character vector of length `n` with names by randomly drawing from a name list: type = {"neutral", "female", "male", "mixed"}. Useful to anonymize scdf files

```R
names(exampleAB) <- sample_names(3)
```

-`add_l2()`: Adds the variables from a second level 2 data frame to an scdf matched by an id variable (default is `case`).

```R
Leidig2018 %>%
  add_l2(Leidig2018_l2) %>%
  hplm(update.fixed = .~. + gender + migration + ITRF_TOTAL*phaseB, 
       slope = FALSE, random.slopes = FALSE, lr.test = FALSE)
```

- `select_phases()`: selects and recombines phases into A and B phase (equivalent to the phases argument of various functions, but useful when using %>% operators).

```R
exampleA1B1A2B2 %>% 
  select_phases(A = c(1, 3), B = c(2, 4)) %>%
  overlap()
```

- `set_vars()`: change the core variables of an scdf (arguments `dvar` for dependent variable, `pvar` for phase variable, and `mvar` for measurement-time variable).

- `set_dvar()`, `set_mvar()`, `set_pvar()`: Shortcuts to set dvar, mvar, or pvar in a piping script e.g. `exmpleAB_add %>% set_dvar("depression") %>% describe()`

```R
exampleAB_add %>%
  set_vars(dv = "depression") %>%
  overlap()
```

- `is.scdf()`: Tests if an object is of type "scdf" or not.
- `check_scdf()`: Checks for the validity of an scdf object (mainly used for internal tests)
- `convert()`: Creates an scdf syntax file from an scdf object.

```R
# Create a syntax to code the scdf exampleAB and write it into an R file
convert(exampleAB, file = "cases.R")
```

- `cdc`: Applies the Conservative Dual-Criterion Method (CDC; Fisher, Kelley, & Lomas, 2003) to scdf objects.

```R
cdc(Beretvas2008)
cdc(exampleAB_decreasing, decreasing = TRUE, trend.method = "bisplit")
```

### Changes in functions

- `overlap()`: Added Hedges-g.
- new trend lines added to `plot.scdf()`: Koenig's bi-split / quarter intersect (lines = "trendA_bisplit") and Tukey's tri-split / Wald's slope (lines = "trendA_trisplit").

```R
plot(exampleAB_50[8], lines = "trendA_bisplit")
plot(example_A24, lines = "trendA_trisplit")
```

- `plot.scdf()`: Now allows for multiple lines with different line styles.

```R
plot(
  exampleAB, 
  lines = list(
    list(type = "median", col = "red", lwd = 0.5),
    list(type = "trend", col = "blue", lty = "dashed", lwd = 2),
    list(type = "loreg", f = 0.2, col = "green", lty = "solid", lwd = 1)
  )
)
```

- `tau_u()`: Solved bug in meta analysis #6. Reworked the complete function to be more clear and accurate. Added `method_meta` switching between fixed and random-effect meta analyses. Reworked the print function to look nicer.

- `export()`: Reworked the html output. Added a basic output for tau_u. Arguments `caption` and `footnote` allow to specify appearance (if left NA object specific output is generated.). `booktab = TRUE` is now set as a default for kable options.

### Deleted deprecated functions

The following functions were deprecated since 2017 and are now removed from scan:

- `makesingleSC()`
- `makeSCDF()`: Please use `scdf` instead.
- `estimateSC()`: Please use `estimate_design()`
- `power.testSC()`: Please use `power_test()`

### Bugs

- `print.scdf()` now prints cases when all variable names are wider than the current screen with.

# scan 0.52

## Major changes

-   `describe()` as the new alias for `describeSC()`
-   `plot.scdf()`, `style_plot()`: New options to style casenames: `names` which takes a list with tag = value structure. Example:

``` {.r}
new_style <- style_plot()
new_style$names$side <- 3
new_style$names$line <- -1.7
new_style$names$col <- "darkred"
new_style$names$cex <- 1.5
new_style$names$at <- 20
new_style$names$adj <- 1
new_style$names$font <- 3
plot(exampleAB_decreasing, style = new_style)
```

-   `plot.scdf()`, `style_plot()`: Different background colors for different phases:

``` {.r}
new_style <- style_plot()
new_style$fill.bg <- c("aliceblue", "mistyrose1", "honeydew")
new_style$lty.seperators <- 0
plot(exampleABC, style = new_style)
```

``` {.r}
plot(exampleABAB, style = c("default", "phase_shade"))
```

# scan 0.50.5

## Major changes

-   fixed bug in plot function

# scan 0.50.4

## Major changes

-   New `subset()` function (method from base `subset()` for selecting variables, rows, and cases. It takes the arguments `subset`, `select`, and `cases`.

``` {.r}
subset(exampleAB, (values < 60 & phase == "A") | (values >= 60 & phase == "B"))
subset(exampleAB_add, select = c(-cigarrets, -depression))
subset(exampleA1B1A2B2, phase %in% c("A1", "B2"), cases = Pawel:Moritz)
```

# scan 0.50.2

## Major changes

-   New `select_cases()` function.

``` {.r}
select_cases(exampleAB, "Johanna", "Karolina")
select_cases(exampleAB, 1,2)
select_cases(exampleAB, "-Johanna")
```

# scan 0.50

## Major changes

-   Started dropping the `SC` extension from function names e.g. `overlapSC()` becomes `overlap()`

# scan 0.40

CRAN release 2019-08-11

# scan 0.20

CRAN release 2016-10-15

