Stata 15 help for nchi2()

[FN] Statistical functions


nchi2(df,np,x) Description: the cumulative noncentral chi-squared distribution; 0 if x < 0

df denotes the degrees of freedom, np is the noncentrality parameter, and x is the value of chi-squared.

nchi2(df,0,x) = chi2(df,x), but chi2() is the preferred function to use for the central chi-squared distribution. Domain df: 2e-10 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

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