mp - dataframetime=c666710131622236910111719202532323435trt=rep6-MP11event=rep111pl - dataframetime=c11223445588881111121215172223252627282930313336trt=repplacebo21event=rep121data - rbindmppl mp - da

The error messages indicate that there is a mismatch in the number of rows between the data frames being combined. The first error message suggests that the "mp" data frame has 11 rows and the "pl" data frame has 21 rows. The second error message suggests that the "pl" data frame has 30 rows and the "mp" data frame has 21 rows.

To fix this issue, we need to ensure that both data frames have the same number of rows before combining them. One option could be to add missing rows to the "mp" data frame to match the number of rows in the "pl" data frame. Another option could be to remove some rows from the "pl" data frame to match the number of rows in the "mp" data frame.

Alternatively, we could use a different approach to combine the data frames, such as using the "merge" function with a common identifier variable, or using the "dplyr" package to perform a join operation