testing assumptions of fixed effect model

[sohail]

hi,

I have panel dataset of FTSE-100 companies containing 100 cross section and 8 years of data. I have used fixed effect model. Fixed effect results are given below. How can i do the following?
1) test normality of panel data?
2) test for multicollinearity in panel data?
3) test for hetero in panel data?
4) test for serial correlation in panel data?

please advise. thanks

sohail