r - How to combine two categorical variables?

Question

I have a dataset with two variables where participants replied yes (1), no (2) or skipped (-9). I would like to combine these two variables so that anyone who answered yes to one or the other will be placed in the yes (1) category.

Basic format I have and what I'd like to have including variable names:

I have previously tried:

ipv <- M$PSO_PS * M$SSO_PS

I don't think this is correct though because the table with answers does not show the same number of participants (it is fewer).

question from:https://stackoverflow.com/questions/65546438/how-to-combine-two-categorical-variables

Answer 1

Waitting for answers