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05-08-2011 09:43 PM

Hi,

I have a question for the use and result of 'assess' statement in SAS proc phreg.

I used the following code. I got plot of Standardized Score Process and p_value.

I found the p_value for the testing of Proportional Assumption changes for different run.

How to explain the plot? And how to explain the changes of the p_value for the testing? Due to resampling? I am not familiar with the inside calculation.

Thanks a lot!!

ods graphics on;

proc phreg data = days;

class trt;

model pfsdays*cen(1) = trt / rl;

assess ph resample;

run;

ods graphics off;

I have a question for the use and result of 'assess' statement in SAS proc phreg.

I used the following code. I got plot of Standardized Score Process and p_value.

I found the p_value for the testing of Proportional Assumption changes for different run.

How to explain the plot? And how to explain the changes of the p_value for the testing? Due to resampling? I am not familiar with the inside calculation.

Thanks a lot!!

ods graphics on;

proc phreg data = days;

class trt;

model pfsdays*cen(1) = trt / rl;

assess ph resample;

run;

ods graphics off;

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05-15-2011 09:39 PM

No one answer? I really hope to understand the basic of the plot.

What does the Standardized score process (y_value) mean?

I tried more. If I use difference reference in the code, the plot just is like a mirror opposite. All positive values become negative vallues but the absolute values seems just the same.

Thanks a lot!!

ods graphics on;

proc phreg data = days;

class trt (ref = 'A'); **or ref = 'B';

model pfsdays*cen(1) = trt / rl;

assess ph resample;

run;

ods graphics off;

What does the Standardized score process (y_value) mean?

I tried more. If I use difference reference in the code, the plot just is like a mirror opposite. All positive values become negative vallues but the absolute values seems just the same.

Thanks a lot!!

ods graphics on;

proc phreg data = days;

class trt (ref = 'A'); **or ref = 'B';

model pfsdays*cen(1) = trt / rl;

assess ph resample;

run;

ods graphics off;