kill_cols: Kill off non-informative columns in a data.frame
In brendan-R/brocks: The Personal R Functions of Brendan Rocks

Description Usage Arguments Value Author(s) Examples

kill_cols accepts a data.frame or matrix, and returns another, containg only the columns with more than one unique non-missing value. By default, empty strings ("") are converted to NA, and not considered informative.

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kill_cols(x, empty_strings = TRUE)

killcols(x, empty_strings = TRUE)

`x`	A `data.frame`
`empty_strings`	`logical`. Should empty strings ("") be converted to `NA`?

A data.frame, less non-varying variables.

Brendan Rocks rocks.brendan@gmail.com

# If we filter test_data down to just those in a particular income group,
# income groups no longer vary

data(test_data)
test_data2 <- test_data[test_data$income == '$0 - $40k',]

# Now kill_cols will remove the income column, as it no longer varies

kill_cols(test_data2)