GVFC                    Calculates the raw Visual Fast Count (VFC)
                        estimator of the mean abundance per transect
GVFCMOM                 Function to calculate the method of moments
                        visual fast count estimator
addnoise                Creates random errors for use in power.trend.
detect                  Probability of circular patch detection
detect.prop             Probability of detecting a feature that covers
                        a proportion 'theta' of the survey area.
emon-package            Tools for environmental and ecological survey
                        design and analysis
expected.nb             Expected value of Visual Fast Count Estimator
                        assuming Negative Binomial distribution for
                        counts
expected.pois           Expected value of Visual Fast Count Estimator
                        assuming Poisson distribution for counts
fS.detect               Used in the function detect
fT.detect               Used in function detect
generate.trend          Generates a set of mean values.
is.wholenumber          To check whether an argument is an integer
mannkendall             Mann-kendall test for trend
mannkendall.stat        Mann-Kendall statistic.
mom.min.nb              Minimising function for VFC MOM estimator
                        assuming Negative Binomial counts.
mom.min.pois            Minimising function for VFC MOM estimator
                        assuming Poisson counts.
n.min                   Minimising function used in 'precision'.
permute.BACI            Does non-parametric randomisation test for the
                        interaction term in a BACI design.
permute.groups          Does randomisation test for the difference in
                        means of two vectors 'v1' and 'v2'.
power.BACI              Calculates power for a Before and After Control
                        Impact (BACI) design.
power.groups            Power for comparing mean of two groups
power.trend             Calculates power by simulation to detect a
                        specified trend.
precision               Sample size for given precision or precision
                        for given sample size
size2.samevar           Calculates negative binomial size to preserve
                        constant variance.
svariog                 Calculates empirical semi-variogram.
