Hsiao Akaike's Final Prediction error (FPE)

[terran190]

Hi,
I want to ask that in the formula for FPE lag consideration (FPE combining with Granger causality test), what does T stand for? Is it the intial sample size or is it the sample size after adjustment for the number of lag?

Formula: [T+ l11 +1]/[T-l11-1] x RSS(l11)/T

l11: lag order

Reference: S-H Yoo / Energy policy 34(2006) 3573- 3582