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 LOG RANG in KAPLAN-MEIER analyses		  New Topic  Reply to Topic
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Eisenhauer77

Austria
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Posted - 11/23/2011 :  10:19:08 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 8G.0.63.988 SR6
Operating System: Win7

Hi. I am wondering if it is possible to compare 3 or more groups simultaneously using KAPLAN-MEIER survival analyses with LOG RANG test? I can plot 3 groups or more in the survival graph, but get only one LOG RANG probability value... How can I test for differences between each possible pair of groups?

Thanks for your help!

Echo_Chu

China
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Posted - 11/24/2011 :  03:51:26 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi, Tobias,

I am afraid that currently there is no a easy way in Origin for you to compare the survival functions pairwisely.

A workaround for it is

1) Sort worksheet by the group column. (Highlight the group column, right click and select Sort Worksheet: Ascending )
2) Run Kaplan-Meier with all data
3) Mask the unneeded groups in source data
4) Click Recalculate button to get log-rank result of your disired pair of groups.

Repeat step 3, 4 above to get log-rank result of each pair of groups.

Echo
OriginLab Corp
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