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 *  DESCRIPTION
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 *  DESCRIPTION
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 *
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 *
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 *	The quantile function of the chi-squared distribution.
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 *	The quantile function of the chi-squared distribution.
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 */
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 */
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#include "Mathlib.h"
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#include "nmath.h"
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#include "dpq.h"
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#include "dpq.h"
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double qchisq(double p, double df, int lower_tail, int log_p)
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double qchisq(double p, double df, int lower_tail, int log_p)
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{
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{
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    return qgamma(p, 0.5 * df, 2.0, lower_tail, log_p);
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    return qgamma(p, 0.5 * df, 2.0, lower_tail, log_p);