How to fit Rayleight / folded norma distributions ?

SophieCuvillier — Wed, 19 Mar 2025 13:30:34 GMT

Hello,

Is it possible to fit Rayleight and folded normal distributions ? Just like we have the fit distribution platform, with goodness of fit metrics etc...

Best regards,

Re: How to fit Rayleight / folded norma distributions ?

Byron_JMP — Wed, 19 Mar 2025 18:21:40 GMT

maybe take a look at the Gamma family of distributions, specifically the Weibull distribution.

also, in the life distribution platform you can fit a mixture of distributions,

This data set using 10000 rows with this formula:

Abs( Random Normal( 1, 1 ) )

Analyze>Reliability>Life Distribution, I picked the formula col for the time to event and from the red triangle picked fit mixture. This shows up at the bottom of the report, I click Weibull twice, and then clicked Go

Life Distribution(
	Y( :Column 3 ),
	Confidence Interval Method( Wald ),
	Interval Type( Pointwise ),
	Show Event Plot Frequency Label( 0 ),
	Fit Mixture( Mix( Weibull( 2 ), Overlapping Clusters, Show Profilers( 0 ) ) ),
	SendToReport(
		Dispatch( {"Mixture", "Overlay"}, "5", ScaleBox,
			{Format( "Fixed Dec", 12, 1 ), Min( -0.0507969202844342 ),
			Max( 1.05079692028443 ), Inc( 0.2 ), Minor Ticks( 0 )}
		),
		Dispatch( {"Mixture", "Overlay"}, "4", ScaleBox,
			{Format( "Fixed Dec", 12, 0 ), Min( -0.401614772053014 ),
			Max( 5.23133596019622 ), Inc( 1 ), Minor Ticks( 0 )}
		)
	)
);

Re: How to fit Rayleight / folded norma distributions ?

SophieCuvillier — Wed, 26 Mar 2025 09:55:59 GMT

Hello, Thank you very much for your answer, I will try to do that !

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How to fit Rayleight / folded norma distributions ?

Re: How to fit Rayleight / folded norma distributions ?

Re: How to fit Rayleight / folded norma distributions ?