Statistics Help @ Talk Stats Forum - SPSS
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SPSS usage and programming, SPSS syntax, SPSS output.enTue, 29 Jul 2014 07:45:55 GMTvBulletin60http://www.talkstats.com/images/misc/rss.pngStatistics Help @ Talk Stats Forum - SPSS
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<![CDATA[Spearman's - Monotonic?]]>
http://www.talkstats.com/showthread.php/56972-Spearman-s-Monotonic?goto=newpost
Mon, 28 Jul 2014 13:16:29 GMTGood afternoon,

I am looking forward for a help.

I have to do Spearman's correlation for 2 rank variables, one assumption to met is being monotonic .. I tried to do scatterplot, but I got points that is ordered over each other perfectly forming nearly a square. And so, I couldn't decide weather it is monotonic or not!

How I can test the monotonicity for ordinal variables?

Thank in advancce
Regards,

]]>SPSSHadiRabeehttp://www.talkstats.com/showthread.php/56972-Spearman-s-MonotonicCox regression model, hazard ratio , using categorical data.
http://www.talkstats.com/showthread.php/56955-Cox-regression-model-hazard-ratio-using-categorical-data.?goto=newpost
Sun, 27 Jul 2014 08:46:58 GMTHello everyone!
I am studying the effect of 8 arm of treatments on a cohort of 80 mice. The variable I have are: time status and arm of treatment....Hello everyone!
I am studying the effect of 8 arm of treatments on a cohort of 80 mice. The variable I have are: time status and arm of treatment.
I generated KM curves and obtained by log rank test both a general p.value and pairwise comparisons between couples of curves.

Then, I needed to calculate the hazard ratio.

So I used cox regression model.
Considering ARM a categorical value ( scored from 0-7) I have some problems with my output.
If I don t consider ARM as a categorical value spss gives me just one value for expB. (Is it a general value ?)
If I consider it as a categorical ( as it is) it let me choose an indicator and it calculates the HR using as indicator or the final or the initial arm.

Is it correct? Is it possible to get an HR for each pairwise comparison?
Which p should I use for each pairwise comparison? the one from KM curves or the one generated with cox regression output for HR?

Thank you very much, please be kind with a MD who is just approaching to statistics
]]>SPSSklauz88http://www.talkstats.com/showthread.php/56955-Cox-regression-model-hazard-ratio-using-categorical-data.