4385132063

Build # 4385132063

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Commit Message

Merge pull request #316 from jecisc/divers-cleanings

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18.42

/src/Math-Distributions/PMChiSquareDistribution.class.st

Class {
        #name : #PMChiSquareDistribution,
        #superclass : #PMGammaDistribution,
        #category : #'Math-Distributions-Gamma'
}

{ #category : #creation }
PMChiSquareDistribution class >> degreeOfFreedom: anInteger [
        "Create a new instance of the receiver with given degree of freedom."

        ^ anInteger > 40
                ifTrue: [ PMAsymptoticChiSquareDistribution degreeOfFreedom: anInteger ]
                ifFalse: [ super shape: anInteger / 2 scale: 2 ]
]

{ #category : #information }
PMChiSquareDistribution class >> distributionName [

        ^'Chi square distribution'
]

{ #category : #creation }
PMChiSquareDistribution class >> fromHistogram: aHistogram [
        "Create an instance of the receiver with parameters estimated from the given histogram using best guesses. This method can be used to find the initial values for a fit.        "
        | dof |
        aHistogram minimum < 0
                ifTrue: [ ^nil].
        dof := aHistogram average rounded.
        ^dof > 0 ifTrue: [ self degreeOfFreedom: aHistogram average rounded]
                         ifFalse:[ nil]
]

{ #category : #creation }
PMChiSquareDistribution class >> shape: aNumber1 scale: aNumber2 [

        ^self error: 'Illegal creation message for this class'
]

{ #category : #transformation }
PMChiSquareDistribution >> changeParametersBy: aVector [
        "Modify the parameters of the receiver by aVector."

        super changeParametersBy: (Array with: aVector first / 2 with: 0)
]

{ #category : #information }
PMChiSquareDistribution >> confidenceLevel: aNumber [
        "Answer the probability in percent of finding a chi square value distributed according to the receiver larger than aNumber."

        ^ (1 - (self distributionValue: aNumber)) * 100
]

{ #category : #information }
PMChiSquareDistribution >> parameters [

        ^ Array with: alpha * 2
]

1	Class {
2	#name : #PMChiSquareDistribution,
3	#superclass : #PMGammaDistribution,
4	#category : #'Math-Distributions-Gamma'
5	}
6
7	{ #category : #creation }
8	PMChiSquareDistribution class >> degreeOfFreedom: anInteger [	3✔
9	"Create a new instance of the receiver with given degree of freedom."	3✔
10		3✔
11	^ anInteger > 40	3✔
12	ifTrue: [ PMAsymptoticChiSquareDistribution degreeOfFreedom: anInteger ]	3✔
13	ifFalse: [ super shape: anInteger / 2 scale: 2 ]	3✔
14	]	3✔
15
16	{ #category : #information }
17	PMChiSquareDistribution class >> distributionName [	×
18		×
19	^'Chi square distribution'	×
20	]	×
21
22	{ #category : #creation }
23	PMChiSquareDistribution class >> fromHistogram: aHistogram [	×
24	"Create an instance of the receiver with parameters estimated from the given histogram using best guesses. This method can be used to find the initial values for a fit. "	×
25	\| dof \|	×
26	aHistogram minimum < 0	×
27	ifTrue: [ ^nil].	×
28	dof := aHistogram average rounded.	×
29	^dof > 0 ifTrue: [ self degreeOfFreedom: aHistogram average rounded]	×
30	ifFalse:[ nil]	×
31	]	×
32
33	{ #category : #creation }
34	PMChiSquareDistribution class >> shape: aNumber1 scale: aNumber2 [	×
35		×
36	^self error: 'Illegal creation message for this class'	×
37	]	×
38
39	{ #category : #transformation }
40	PMChiSquareDistribution >> changeParametersBy: aVector [	×
41	"Modify the parameters of the receiver by aVector."	×
42		×
43	super changeParametersBy: (Array with: aVector first / 2 with: 0)	×
44	]	×
45
46	{ #category : #information }
47	PMChiSquareDistribution >> confidenceLevel: aNumber [	×
48	"Answer the probability in percent of finding a chi square value distributed according to the receiver larger than aNumber."	×
49		×
50	^ (1 - (self distributionValue: aNumber)) * 100	×
51	]	×
52
53	{ #category : #information }
54	PMChiSquareDistribution >> parameters [	×
55		×
56	^ Array with: alpha * 2	×
57	]	×

PolyMathOrg / PolyMath / 4385132063

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