prop.test
{stats}
Test of Equal or Given Proportions
chisq.test
{stats}
Chi-Squared test (e.g. for cross-tabulations)
ordered
{dplyr}
Create an ordered factor
t.test
{stats}
Performs one and two sample t-tests on vectors of data.
table
{base}
Obtain frequency table of a variable/cross-tabulation of two variables
ifelse
{base}
Return a or b depending on the value of test
leveneTest
{car}
Computes Levene’s test for homogeneity of variance across groups.
library
{base}
Load an R package
mutate
{dplyr}
Modify/create a column in a data frame
with
{base}
evaluate expression in the context of a data frame
cut
{base}
Convert Numeric to Factor
setwd
{base}
Set Working Directory
c
{base}
Combine values/vectors into a vector
read_dta
{haven}
Read a .dta file (Stata data)
summary
{base}
Obtain summary statistics or detailed regression output
The end!