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Ceg1
Ceg1
Level II

Group homogeneity tests - difference when using right censor and interval censored data

Nov 6, 2023 10:36 AM (589 views)

Hi,

 

can you explain how JMP handles Group homogeneity tests (Logrank, Wilcoxon, Peto-Peto) with different type of event censoring? Are there any differences in methods used by JMP to calculate those tests under different event censoring?

 

I made a 2 populations comparisons in JMP platform Life Distribution - Compare Groups, using same dataset, but with different event censoring definition. For uncensored events, p-value for tests was around 10%, whereas for interval censored events tests' p-value dropped to 1%, which changes the analysis conclusion.

Below are JMP results:

Events Interval Censoring

Ceg1_0-1699274499731.png

 

Uncensored events

Ceg1_1-1699274532768.png

 

Additional question: For uncensored event case, sometimes in statistics summary table an unnamed column is added with term "Biased" in it. What does it mean in this context? I couldn't find any information on this in JMP documentation. 

 

Thank you for your help.

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matimur1906
matimur1906
Level I

Re: Group homogeneity tests - difference when using right censor and interval censored data

Mar 7, 2024 09:33 AM (437 views)  |  Posted in reply to message from Ceg1 11-06-2023

Hello,

I am facing the same problem, does anyone know the answer?

Thank you,

MM

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