# Keng 2026.3.19

* `power_r`, `power_lm()`, `print.Keng_power()`, and `plot.Keng_power()` have been rewritten using `uniroot()`.

# Keng 2026.1.5

* `Scale()` has been rewritten.
* `divide()` has been added to divide a vector into three groups.

# Keng 2025.10.8

* The bug of `length(...)` has been fixed.
* `powered_r()` and `powered_lm()` are used to compute powers, and `power_r()` and `power_lm()` have been rewritten.

# Keng 2025.9.1

* The codes for pick_* tools have been refined.
* `assess_coa()` has been added to assess course objective achievement in Outcome-Based Education.

# Keng 2025.8.16

* `pick_sl()` and `pick_dcb()` have been added to randomly pick numbers for Chinese 
Super Lotto and Double Color Balls.

# Keng 2025.02.05

* Some spelling errors have been corrected.

# Keng 2024.12.15

* `power_r()` has been added to conduct post-hoc and a priori power analysis, and plan the sample size for Pearson's r.
* `power_lm()` has reorganized its output.
* `power_r()` and `power_lm()` return the `Keng_power` class, which has `print()` and `plot()` methods.

# Keng 2024.11.25

* `test_r()` has added Fisher's z.
* `compare_lm()` has added f_squared and post-hoc power.
* `calc_PRE()` has been added to calculate PRE from partial correlation, Cohen's f, or f_squared.
* `power_lm()` has been added to conduct post-hoc and a priori power analysis, and plan the sample size for one or a set of predictors in linear regression.

# Keng 2024.11.17

* Added a `NEWS.md` file to track changes to the package.
* Dataset `depress` is added.
* Format of `compare_lm()`'s output is reorganized.
* Versatile `Scale()` is added. 
