factor
{base}
Create a factor
filter
{dplyr}
Filter out rows of a data frame according to logical vector
prop.test
{stats}
Test of Equal or Given Proportions
qt
{stats}
Quantile function for t-distribution
with
{base}
evaluate expression in the context of a data frame
order
{base}
Get indexes that will sort a vector
levels
{base}
Get levels of a factor
scale_x_continuous
{GGPLOT2}
Customise continuous x axis
slice
{dplyr}
Select rows by position
rm
{base}
Remove objects
ungroup
{dplyr}
Resolve grouping created with “group_by”
geom_histogram
{GGPLOT2}
Generates a histogram
rnorm
{base}
Generate random numbers from a normal distribution
ifelse
{base}
Return a or b depending on the value of test
range
{base}
Return range of values
recode_factor
{dplyr}
Recode factor values, changing the levels and their order
mean
{base}
Get mean of a vector
sd
{stats}
Get standard deviation of a vector
ls
{base}
Return a vector of character strings giving the names of the objects in the specified environment
as.numeric
{base}
Coerce a vector to numeric
select
{dplyr}
Select columns from a tibble/data frame
setwd
{base}
Set Working Directory
data.frame
{base}
Create a data.frame from vectors
tibble
{tibble}
A modern data frame from the tidyverse
as.character
{base}
Coerce a vector to character
read_dta
{haven}
Read a .dta file (Stata data)
install.packages
{utils}
Install R packages
table
{base}
Obtain frequency table of a variable/cross-tabulation of two variables
is.na
{base}
Check if a value is NA/elements of vector are NA
recode
{dplyr}
Recode a variable
exists
{base}
Test whether a named object/variable exists
cat
{base}
Concatenate and print objects to the console without quotes or indices
scale_y_continuous
{GGPLOT2}
Customise continuous y axis
labs
{GGPLOT2}
Customise labels in GGPLOT2
round
{base}
Rounds numbers
group_by
{dplyr}
Group tibble/data.frame by a factor variable. All further tidyverse operations are performed group-wise
plot
{graphics}
Generic function from base R to produce a plot
pwr.t.test
{pwr}
Calculate power, sample size, or effect size for t-tests
library
{base}
Load an R package
c
{base}
Combine values/vectors into a vector
head
{utils}
Show first 5 rows of a data frame
write_dta
{haven}
Write Stata files
spread
{tidyr}
Spread a key-value pair across multiple columns
aggregate
{stats}
Compute summary statistics of data subsets / by groups
summary
{base}
Obtain summary statistics or detailed regression output
write.csv
{utils}
write a csv file to a data frame
expression
{base}
Used in plots to add symbols to axes
cut
{base}
Convert Numeric to Factor
which.min
{base}
Return the index of the smallest value in a vector
install_rsthemes
{rsthemes}
Install the rsthemes collection of RStudio themes
arrange
{dplyr}
Sort values of data frame according to a variable/combination of variables
theme_classic
{GGPLOT2}
A minimalistic theme with no gridlines
power.t.test
{stats}
Power calculations for one- and two-sample t-tests
names
{base}
Get or set names of an object
separate
{tidyr}
Split columns
coord_cartesian
{GGPLOT2}
Zoom into a plot region without removing data (set Cartesian axis limits)
boxplot
{graphics}
Plot a simple box plot
geom_hline
{GGPLOT2}
Add a horizontal line in GGPLOT2
seq
{base}
Create a sequence
str
{utils}
Get the structure of an R object
sapply
{base}
Apply a function over a vector or list and simplify the result
max
{base}
Get maximum of a vector
summarize
{dplyr}
Collapse the dataset to a summary statistic (American-spelling alias of summarise)
ordered
{dplyr}
Create an ordered factor
View
{base}
View a data frame
stat_ecdf
{GGPLOT2}
Compute empirical cumulative distribution
which.max
{base}
return index of the largest value in a vector
n
{dplyr}
The number of observations in the current group.
quantile
{stats}
Obtain empirical quantiles of a vector
pt
{stats}
Calculate the cumulative distribution function of the t-distribution
sqrt
{base}
Square-root function
factor
{base}
Create factor variables
mutate
{dplyr}
Create new variables
aes
{GGPLOT2}
Construct aesthetic mapping of a ggplot graph
subset
{base}
Return subsets of vectors, matrices or data frames which meet conditions.
median
{stats}
Get median of a vector
summarise
{dplyr}
collapse the dataset to a summary statistic. Usually used with group_by()
set.seed
{base}
Initialise a pseudorandom number generator.
desc
{dplyr}
Arrange in descending order
read.csv
{utils}
Read a csv file to data frame. Specify stringsAsFactors = FALSE to keep all string columns as characters
t.test
{stats}
Performs one and two sample t-tests on vectors of data.
geom_line
{GGPLOT2}
Generates a line
sum
{base}
Get sum of numeric values or a vector
save
{base}
Save R objects
sprintf
{base}
C-style formatted string printing
hist
{graphics}
Plot a simple histogram
theme_minimal
{GGPLOT2}
A minimalistic theme with no background annotations
ceiling
{base}
Round numbers up to the smallest following integer
min
{base}
Get minimum of a vector
length
{base}
Returns number of elements in an object
replicate
{base}
Repeatedly evaluate an expression (wrapper around sapply)
nrow
{base}
Get number of rows of a data frame
geom_abline
{GGPLOT2}
Add a reference line with a given slope and intercept
ggplot
{GGPLOT2}
Create a ggplot graph
read_excel
{readxl}
Read an Excel file
print
{base}
Print object to the console
complete.cases
{stats}
Find Complete Cases
var
{stats}
Calculate variance
The end!