When using the "life distribution" function in the "reliability and survival" portion of the analyze tool, why don't they need initial conditions to find the Weibull parameters? Thanks!
I try to capture all steps: (usually you would use a censor but it#s not required to show the options)
1. Just the time to event data
You have to select weibull from the compare distributions panel, then in the statistics section under Weibull the hotspot and select Fix Parameter (2nd picture). The 3rd picture shows the appearing report where you can set weibull alpha and beta.
2. With Failure information to see distributions for each failure cause.
This is as you described it.
If you want to be able to fix the parameters in the individual failure cause distributions you have to set this optin already in the launch window (above picture). then you select weibull in the compare distribution panel, go to individual distributions of one of the failure causes and select there the Fix Parameter similar to the first option:
3. Competing Risk Mixture Option:
Heree you will not ahave the option to specify Fix Parameter for the weibull as it tries to find the weibull parameters depending on the mixture of the distributions you set in advance.
Hope this explains the different options.
May these two threads answer your question already?
Life-Distribution-Fixing-p-and-fixing-Weibull-beta-in-DS-Weibull
Weibull-distribution-solving-for-a-quot-pooled-quot-Weibull-beta
Thanks so much for the links! If you're doing a competing risk analysis, there isn't a red triangle that pops up to vary the parameters. In this case, how would the initial conditions be specified?
When you use the competing causes in the life distribution platform you need to specify the setting upfront in the launch window:
Then you can in the individual weibull fits fix the parameter settings as well. The fix parameter option will not appear if you have not checked that box in the launch window or set it in the preferences of this platform.
Ok, I tried those steps using JMP Pro 15, but it seems that I'm still not able to change the parameters in the below image? Thank you so much for your help for your previous posts! I really appreciate it.
