All Functions Used on PO12Q

recode

{dplyr}

Recode a variable

c

{base}

Combine values/vectors into a vector

ls

{base}

Return a vector of character strings giving the names of the objects in the specified environment

summary

{base}

Obtain summary statistics or detailed regression output

scale_x_continuous

{GGPLOT2}

Customise continuous x axis

setwd

{base}

Set Working Directory

theme_classic

{GGPLOT2}

A minimalistic theme with no gridlines

xlab

{GGPLOT2}

Label the x axis (ggplot)

vcovHC

{sandwich}

Heteroscedasticity-consistent estimation of the covariance matrix of the coefficient estimates

ifelse

{base}

Return a or b depending on the value of test

pchisq

{stats}

Gives the distribution function of the chi-squared distribution

coeftest

{lmtest}

Inference for Estimated Coefficients

droplevels

{base}

Drop Unused Levels from Factors

chisq.test

{stats}

Chi-Squared test (e.g. for cross-tabulations)

with

{base}

evaluate expression in the context of a data frame

read_dta

{haven}

Read a .dta file (Stata data)

ordered

{dplyr}

Create an ordered factor

set.seed

{base}

Initialise a pseudorandom number generator.

select

{dplyr}

Select columns from a tibble/data frame

subset

{base}

Return subsets of vectors, matrices or data frames which meet conditions.

geom_smooth

{GGPLOT2}

Generates a smoothed conditional means curve / line

names

{base}

Retrieve names of a list/vector

leveneTest

{car}

Computes Levene’s test for homogeneity of variance across groups.

library

{base}

Load an R package

ggplot

{GGPLOT2}

Create a ggplot graph

bptest

{lmtest}

Breusch-Pagan Test for Homoscedasticity

as.numeric

{base}

Coerce a vector to numeric

cut

{base}

Convert Numeric to Factor

sample_frac

{dplyr}

Sample a fraction of observations from a data frame

t.test

{stats}

Performs one and two sample t-tests on vectors of data.

confint

{stats}

Calculate confidence Intervals for Model Parameters

table

{base}

Obtain frequency table of a variable/cross-tabulation of two variables

filter

{dplyr}

Filter out rows of a data frame according to logical vector

geom_point

{GGPLOT2}

Generates a scatter plot

relevel

{stats}

Reorder Levels of Factor

is.element

{base}

Check if a value is element of a vector

log

{base}

log (default base = e)

rm

{base}

Remove objects

mutate

{dplyr}

Modify/create a column in a data frame

levels

{base}

Get levels of a factor

as.character

{base}

Coerce a vector to character

prop.table

{base}

Transform frequency table into table of proportions

prop.test

{stats}

Test of Equal or Given Proportions

lm

{base}

Fit a linear model

stargazer

{stargazer}

Create a regression output table

read_excel

{readxl}

Read an Excel file

vif

{car}

Calculate Variance Inflation Factor

ylab

{GGPLOT2}

Label the y axis (ggplot)

scale_y_continuous

{GGPLOT2}

Customise continuous y axis

aes

{GGPLOT2}

Construct aesthetic mapping of a ggplot graph

nobs

{gdata}

Compute the number of non-missing observations

resid

{stats}

Extracts model residuals from objects returned by modeling functions

attach

{base}

Attach Set of R Objects to Search Path

read.csv

{utils}

Read a csv file to data frame. Specify stringsAsFactors = FALSE to keep all string columns as characters

The end!