How to deal with nonstandard column names (white space, punctuation, starts with numbers)...

Why can't I get a p-value smaller than 2.2e-16?...

How to convert a factor to integer\numeric without loss of information?...

Create a group index for values connected directly and indirectly...

Error: could not find function ... in R...

Collapse / concatenate / aggregate a column to a single comma separated string within each group...

Numeric comparison difficulty in R...

Changing date format in R...

Should I use a data.frame or a matrix?...

Grouping functions (tapply, by, aggregate) and the *apply family...

dplyr left_join by less than, greater than condition...

Numbering rows within groups in a data frame...

Split comma-separated strings in a column into separate rows...

Calculate the mean by group...

Round up from .5...

Select the row with the maximum value in each group...

Error: unexpected symbol/input/string constant/numeric constant/SPECIAL in my code...

Add regression line equation and R^2 on graph...

Installing older version of R package...

Use dynamic name for new column/variable in `dplyr`...

Rename multiple columns by names...

Order Bars in ggplot2 bar graph...

duplicate 'row.names' are not allowed error...

Plot two graphs in a same plot...

Dynamically select data frame columns using $ and a character value...

How to create a consecutive group number...

Using R to download zipped data file, extract, and import data...

Pass a data.frame column name to a function...

How to debug "contrasts can be applied only to factors with 2 or more levels" error?...

Simultaneously merge multiple data.frames in a list...