stat question

[pacific05]

I recently filled in for a stat guy this weekend and was wondering if any one could answer a couple questions.

1. Do negetive rushing/passing yards get subtacted from gained yards. i.e. if a guy runs for 100 yards on the night, but was stuffed for a 5 yard loss on 1 play, does he still get credit for 100.

2. Do extra yards added at the end of a run/rec. due to penalty get credited to the player's yard. i.e. if a running back gains 5 yards on a run, but gets his face mask grabbed, does he get the extra penalty yards credited to him?