lm
{stats}
Fit linear models using least squares
as.data.frame
{base}
Functions to check if an object is a data frame, or coerce it if possible.
as.character
{base}
Coerce a vector to character
ifelse
{base}
Return a or b depending on the value of test
which
{base}
return indexes of TRUE entries of a logical vector
sample
{base}
Takes a sample of the specified size
log
{base}
log (default base = e)
bar
{base}
Used for annotations, such as “expression(paste(”-“,bar(y)))”
subset
{base}
Return subsets of vectors, matrices or data frames which meet conditions.
nobs
{stats}
Return the number of observations in a model object
data.frame
{base}
Create a data.frame from vectors
expression
{base}
Used in plots to add symbols to axes
rnorm
{base}
Generate random numbers from a normal distribution
The end!