I'm new to investing and as an exercise I am trying to calculate key stats from google finance for Apple (AAPL). One of the first statistics I am trying to replicate is EPS, which google finance and Scottrade have currently listed at $6.19.
My understanding is that EPS is calculated by: (Previous 4 quarters Net Income) / Current outstanding Shares. At the time of Apple's last 10-Q statement (7/23), annualized net income was $38,555M and outstanding shares was 5.989171B, resulting in EPS of $6.44.
I could be being obsessive about this but why the discrepancy? Just trying to increase my understanding here.