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Hi all,
This afternoon I decided to plot my hazard ratio's and confidence intervals in a forest plot (horizontal bars). However, when I plot my effect sizes and confidence intervals, they are not symmmetrical (e.g. the length from the effect size to the upper and lower bound are not equal....). I have no clue how this could have happened.
I obtained by data with the PHREG procedure. The piece of syntax I used looks basically like this:
PROC PHREG data=mydata;
CLASS var1 var2 var3/ref=first;
MODEL survival*censor(0) = var1 var2 var3 / RL;
RUN;
Really hope someone can help me out!
Kind regards,
Marjolein
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I believe this is correct. Your likely plotting on a linear scale, while the model developed is an exponential model.
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I believe this is correct. Your likely plotting on a linear scale, while the model developed is an exponential model.
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Ah! That makes sense!!! Thank you so much. This is quite a relief 🙂
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By default the oddsratio plot is on a linear scale. You can use the LOGBASE=10 option on the PLOTS=ODDSRATIO option to generate the oddsratio plot on a log scale, which I think is more natural. See the discussion and example in the article "Odds ratio plots with a logarithmic scale in SAS."