CODEWITHSUNDEEP
r
Lucysmithh
Lucysmithh

Reputation: 1

Cohen d paired samples factor and data unequal length

I am trying to compute Cohen's d following a paired-samples t test. I have two groups within the data set that I would like separate d values for, one group contains more participants (rows) than another, which I think may be why I am getting an error message that says "data and factor must have the same length".

My code is simply

cohen.d(TUGpre, TUGpost, paired = TRUE, na.rm = TRUE, f = "Group")

which returns the error message

Error in cohen.d default (TUGpre, TUGpost, paired = TRUE, na.rm = TRUE, f = "Group") : Data and factor must have the same length

Thank you in advance.

Upvotes: 0

Views: 257

Answers (1)

Rui Barradas
Rui Barradas

Reputation: 76402

Create a vector with length equal to the sum of the two vectors' lengths and use it as the factor vector in the call to cohen.d.
Untested, since there are no data.

f <- c(rep("TUGpre", length(TUGpre)), rep("TUGpost", length(TUGpost)))
cohen.d(c(TUGpre, TUGpost), f, paired = TRUE, na.rm = TRUE, f = "Group")

Upvotes: 0

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