By the way, here is an example where the advice in FAQ 7.10 (change the
factor
columns to numeric) would give incorrect results. The incorrect header
setting
in the call to read.table causes an extra row of non-numeric data to appear
at the
start of the imported data.
> txt <- "ColA ColB\n101 1
You may have read in your data incorrectly - a column you expected to be
numeric was not recognized as such so it was read in a character and then
converted to a 'factor'.
FAQ 7.10 tells how to work around the problem
https://cran.r-project.org/doc/FAQ/R-FAQ.html#How-do-I-convert-factors-to-numer
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