Difference between survival confidence bands generated in PHREG vs. LIFETEST?

[Reeza]

When you encounter issues like this, there are several possible causes. 

1. An old/stolen version of SAS with a bug, or assuming WPS is the same

2. Corrupt installation for some reason though you’d likely get errors

3. Something funky with your data

To eliminate these you need to provide

1. your version of SAS, so can check for known bugs

2. Run the same code with known results on your machine and see if the results match. To test this, you need to run EXACTLY Ricks code and post your log and output as requested. Then we can compare it agains the expected output to see if it matches or not. If it does, then it’s #3 most likely. 

[WillZh]

Thank you, Reeza,

Are you suggesting me to run Nick's code with my own data or Nick's data? I don't have his data. In my prior posts, I provided my own data, log and results. My codes are simplified and almost the same as Nick's code. .

[Reeza]

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@WillZh wrote:

Thank you, Reeza,

Are you suggesting me to run Nick's code with my own data or Nick's data? I don't have his data. In my prior posts, I provided my own data, log and results. My codes are simplified and almost the same as Nick's code. .

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No you don't have his data because it ships with SAS, not with WPS. Otherwise it's available with all SAS installations for exactly this type of situation. 

I'm guessing WPS has different defaults or has an incorrect implementation of PROC PHREG, which is not really a SAS issue. You need to deal with their tech support, not SAS tech support. 

[Reeza · Accepted solution]

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@WillZh wrote:

Thank you, Reeza,

Are you suggesting me to run Nick's code with my own data or Nick's data? I don't have his data. In my prior posts, I provided my own data, log and results. My codes are simplified and almost the same as Nick's code. .

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You need to run it with Rick's data. I suggest setting up a trial of SAS Academics on Demand, running your code in an actual SAS licensed environment and compare that with WPS.

[WillZh]

OK, Thank you, Reeza.Will try your suggestions.

One additional question related to SAS phreg is that, how do we add and change labels of the survival curves created by phreg plot? It seems that plot(overlay) will not give any label to the curves. Add diradj seems the only way to get labels but one cannot edit them..

[Reeza]

SAS has some macros in the documentation appendix that allow you to customize the graph. I'm not sure that it would work in WPS. In addition, you can capture the data and plot it with SGPLOT, but again, I don't know how you'd do that in WPS.

[WillZh]

wonderful. I am interested in knowing how to customize graph in phreg with SAS now....can you guide me to the macros?

[Reeza]

They are in the documentation.