If you run data df $\%>\%$ select $(1,3$:$4,8)$ in Rstudio on

the dataframe, ${?}^{-},$ seen above. The new dataframe data

would contain which columns from

pre$\_$idbatch, period, time, batch, condition, Prerank, Postrank

pre$\_$idbatch, period, time, Postrank

pre$\_$idbatch, post$\_$idbatch, period, time, batch, condition,

Prerank, Postrank

post$\_$idbatch, time, batch, condition