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Level II

## Separate Location parameters using Parametric Survival platform

Hi All,

I am trying to predict hazard rate and MTTF with Eyring model (see attached file).

Using Parametric Survival platform.

In Parameter Estimates report there is scale parameter "sigma" but no separate location parameters for Loglogistic distribution.

Only graphic representation of separate location and separate location & scale are given in Parametric Survival platform.

Is there way to get values of separate location parameters for chosen probabilistic distribution?

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Staff

## Re: Separate Location parameters using Parametric Survival platform

So, use the parameter estimates to compute the Location parameter for each of the conditions:

``Location = -7.2947 + 0.533 * Arrhenius(Temp) + -1.11 * Log(Voltage)``
Learn it once, use it forever!
4 REPLIES 4
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Staff

## Re: Separate Location parameters using Parametric Survival platform

The location is not constant like the scale. The location parameter is the back transformed function of the linear predictor.

Learn it once, use it forever!
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Level II

## Re: Separate Location parameters using Parametric Survival platform

Hi Mark.

I made same analysis in Minitab Accelerated Life Testing plaform.

In the report there is Location parameter for each Temperature-Voltage pair.

By the way vaue of Scale parameter in Minitab is mutches value of same parameter in JMP 0.34

Highlighted
Staff

## Re: Separate Location parameters using Parametric Survival platform

So, use the parameter estimates to compute the Location parameter for each of the conditions:

``Location = -7.2947 + 0.533 * Arrhenius(Temp) + -1.11 * Log(Voltage)``
Learn it once, use it forever!
Highlighted
Level II

## Re: Separate Location parameters using Parametric Survival platform

Hi Mark,

You absolutely right.

For standardized Loglogistic distribution: Location = Ln(T50)

Thank you.

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