Stata 15 help for nchi2()
[FN] Statistical functions
Function
nchi2(df,np,x)
Description: the cumulative noncentral chisquared distribution; 0 if
x < 0
df denotes the degrees of freedom, np is the
noncentrality parameter, and x is the value of
chisquared.
nchi2(df,0,x) = chi2(df,x), but chi2() is the preferred
function to use for the central chisquared
distribution.
Domain df: 2e10 to 1e+6 (may be nonintegral)
Domain np: 0 to 10,000
Domain x: 8e+307 to 8e+307; interesting domain is x > 0
Range: 0 to 1
