NMstats can be installed from GitHub with 

# install.packages("devtools")
devtools::install_github("bjmonk/NMstats")

or via the web with (may require restart):

# install.packages("devtools")
devtools::install_url("https://barrymonk.com/NMstats.tar.gz")

Find usage examples at the NMstats vignette. 

NMstats includes the following functions:

combs
The combs function calculates the number of ways to choose r items from a total of n items without replacement and where the order does not matter.

perms
The perms function calculates the number of ways to choose r items from a total of n items without replacement and where the order matters.

outlier_bounds
The outlier_bounds function computes the lower and upper outlier boundaries of a dataset using the IQR method.

data_range
The data_range function computes the range of a data set.

rel_hist
The rel_hist function computes a relative histogram of given data values.

var.p
The var.p function calculates the population variance of a data set.

sd.p
The sd.p function calculates the population standard deviation of a data set.

Z_Interval
The Z_Interval function calculates the confidence interval for a population mean when the population standard deviation is known.

T_Interval
The T_Interval function calculates the confidence interval for a population mean when the population standard deviation is not known.

One_Prop_Int
The One_Prop_Int function calculates the confidence interval for a population proportion.

Z_Test
The Z_Test function performs a hypothesis test about a population mean when the population standard deviation is known.

T_Test
The T_Test function performs a hypothesis test about a population mean when the population standard deviation is not known.

One_Prop_Test
The One_Prop_Test function performs a one-sample hypothesis test for a population proportion.

Two_Samp_T_Interval
The Two_Samp_T_Interval function constructs a confidence interval for the difference between two population means (mu_1 - mu_2) given two independent samples.

Two_Samp_T_Test
The Two_Samp_T_Test function performs a hypothesis test about the difference between two population means (mu_1 - mu_2) given two independent samples.

Two_Prop_Int
The Two_Prop_Int function calculates the confidence interval for the difference between two population proportions (p_1 - p_2).

Sign_Test
The Sign_Test function performs a nonparametric one-sample Sign Test for a population median. 

Rank_Sum_Test
The Rank_Sum_Test function performs a nonparametric test for comparing the medians of two populations.

Signed_Rank_Test
The Signed_Rank_Test function performs a nonparametric test for testing whether there is a difference between the medians of two populations, when the data are in the form of paired samples.