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Why doesn't 'is' work on a data.frame in R?
I have a data.frame that looks like this |-----ID-----|-----age-----|
| 12 | 19 |
| 15 | 12 |
| 9 | 6 |
| 5 | 2 |
| 8 | 0 |
| 7 | 0 |
I want to find out which ID's have no 'ages' in the data.frame and store them in a new data.frame. I wrote this code to do so,