I know how to convert a simple dataframe from wide to long format with one
varying factor. However, for a dataset with two factors like the following,
Subj T1_Cond1 T1_Cond2 T2_Cond1 T2_Cond2
1 0.125869 4.108232 1.099392 5.556614
2 1.427940 2.170026 0.120748 1.176353
How to elegantly convert to a long form as
Subj Time Cond Value
1 1 1 0.125869
1 1 2 4.108232
1 2 1 1.099392
...
Thanks in advance!
Gang
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