← All changes | libraries/vendor/PhpSpreadsheet/Calculation/Statistical/Distributions/F.php +15 -4 3.3.1 → 3.4 View file →

		@@ -54,10 +54,21 @@
54	54
55	55	return Beta::incompleteBeta($adjustedValue, $u / 2, $v / 2);
56	56	}
57	57
58		- return (Gamma::gammaValue(($v + $u) / 2)
59		- / (Gamma::gammaValue($u / 2) * Gamma::gammaValue($v / 2)))
60		- * (($u / $v) ** ($u / 2))
61		- * (($value ** (($u - 2) / 2)) / ((1 + ($u / $v) * $value) ** (($u + $v) / 2)));
	58	+ if ($value == 0.0) {
	59	+ if ($u === 2) {
	60	+ return 1.0;
	61	+ }
	62	+
	63	+ return ($u === 1) ? INF : 0.0;
	64	+ }
	65	+
	66	+ // Log domain, so large degrees of freedom cannot overflow the Gamma ratio.
	67	+ return exp(
	68	+ Gamma::logGamma(($v + $u) / 2) - Gamma::logGamma($u / 2) - Gamma::logGamma($v / 2)
	69	+ + ($u / 2) * log($u / $v)
	70	+ + (($u - 2) / 2) * log($value)
	71	+ - (($u + $v) / 2) * log(1 + ($u / $v) * $value)
	72	+ );
62	73	}
63	74	}