<P> Its cumulative distribution function is: </P> <Dl> <Dd> F (x; k) = γ (k 2, x 2) Γ (k 2) = P (k 2, x 2), (\ displaystyle F (x; \, k) = (\ frac (\ gamma ((\ frac (k) (2)), \, (\ frac (x) (2)))) (\ Gamma ((\ frac (k) (2))))) = P \ left ((\ frac (k) (2)), \, (\ frac (x) (2)) \ right),) </Dd> </Dl> <Dd> F (x; k) = γ (k 2, x 2) Γ (k 2) = P (k 2, x 2), (\ displaystyle F (x; \, k) = (\ frac (\ gamma ((\ frac (k) (2)), \, (\ frac (x) (2)))) (\ Gamma ((\ frac (k) (2))))) = P \ left ((\ frac (k) (2)), \, (\ frac (x) (2)) \ right),) </Dd> <P> where γ (s, t) (\ displaystyle \ gamma (s, t)) is the lower incomplete gamma function and P (s, t) (\ textstyle P (s, t)) is the regularized gamma function . </P>

What does a chi square of 0 mean