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63 lines
1.7 KiB
Plaintext
63 lines
1.7 KiB
Plaintext
9 months ago
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*! version 1.0.0 TJS 9jun2000
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program define nct2, rclass
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version 6.0
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args t delta df
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tempname p1 p2 ps
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if "`df'" == "" {
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di in gr "Syntax for " in wh "nct2" in gr " is: " _n
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di in wh " nct2 " in gr "t' delta df" _n
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di in gr " where " in wh "t' " in gr "is the observed t"
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di in wh " delta " in gr "is the noncentrality parameter"
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di in wh " df " in gr "is the degrees of freedom" _n
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di in wh " nct2 " in gr "computes " in wh "p" _c
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di in gr " such that P(|t|<=" in wh "t'" in gr "| " in wh "delta" _c
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di in gr ", " in wh "df" in gr ") = 1 - " in wh "p"
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di in gr " and returns the value in result " _c
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di in wh "r(p) " in gr "and global " in wh "S_1" in gr "."
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global S_1 = .
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return scalar p = .
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exit 9
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}
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capture which nctprob
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if _rc == 111 {
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di in re "nct2 requires installation of program nctprob."
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di in wh " (contact T. J. Steichen at steicht@rjrt.com for nctprob)."
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global S_1 = .
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return scalar p = .
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exit 111
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}
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qui nctprob `t' `delta' `df'
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if _rc == 198 {
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di in re "nct2 requires version 3.0.5 or later of integ."
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di in wh " (use " in ye "which integ " _c
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di in wh "to check version number)."
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global S_1 = .
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return scalar p = .
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exit 198
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}
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scalar `p2' = 1 - $S_1
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local t = -`t'
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qui nctprob `t' `delta' `df'
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scalar `p1' = $S_1
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scalar `ps' = `p2' + `p1'
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global S_1 = `ps'
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return scalar p = `ps'
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local t = -`t'
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di _n in gr " P( t <= " -`t' " | delta = " _c
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di in gr `2' ", df = " `3' ") = " in ye `p1'
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di in gr " P( t >= " `t' " | delta = " _c
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di in gr `2' ", df = " `3' ") = " in ye `p2'
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di in gr " P(|t| <= " `t' " | delta = " _c
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di in gr `2' ", df = " `3' ") = " in ye `ps'
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end
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