[aakash58]

I have not read the journal paper yet but I have a concern: people saying they get angry frequently in a survey is not the same as people actually getting angry frequently.

What if those who overestimate how frequently they get angry also overestimate how smart/intelligent they are?

Studies from the lab (or using surveys) hide certain aspects of human behavior and so I feel a lot of research work (mostly in the wild) is needed before generalizing (even correlational conclusion such as this).