[R-sig-teaching] Reverse the scoring of some Columns of a Data Set

[Joel Schwartz]

If your data frame is called df then you can reverse the scoring by doing df$x1 =  rev(df$x1).

To do multiple columns, you can do:

df[ , paste0(“x”,1:3)] = lapply(df[ , paste0(“x”,1:3)], rev)

> On Mar 8, 2017, at 8:34 AM, AbouEl-Makarim Aboueissa <abouelmakarim1962 at gmail.com> wrote:
> 
> Dear All: goods morning
> 
> Sorry if this topic does not match with the r-sig-teaching group.
> 
> 
> Is there is a way to reverse the scoring of the first three columns x1, x2,
> and x3 and keep the original scores for the fourth column x4.
> 
> 
> *Here is an example of the data set:*
> 
> x1 x2 x3 x4
> 2  5   4   4
> 1  1   1   6
> 1  2   1   6
> 2  3   2   4
> 1  2   1   6
> 1  3   1   6
> 2  2   2   5
> 2  1   1   6
> 2  2   4   5
> 5  5   2   1
> 
> I am expecting the output to be:
> x1 x2 x3 x4
> 5  5   2   4
> 2  2   4   6
> 2  1   1   6
> 2  2   2   4
> 1  3   1   6
> 1  2   1   6
> 2  3   2   5
> 1  2   1   6
> 1  1   1   5
> 2  5   4   1
> 
> 
> 
> thank you very much for your help and support
> abou
> 
> ______________________
> AbouEl-Makarim Aboueissa, PhD
> Department of Mathematics and Statistics
> University of Southern Maine
> 
> 	[[alternative HTML version deleted]]
> 
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