Why do we add a +1 to some transformations. Because NAs in the data can prevent transformations. Because zeros in the data can prevent transformations. Because we want to increase the effect size....

Can someone help me with this? I think it is because of zeros or NAs but I am not sure which one.

Extracted text: Why do we add a +1 to some transformations. Because NAs in the data can prevent transformations. Because zeros in the data can prevent transformations. Because we want to increase the effect size. Because we want to improve the confidence interval.