Statistics Help @ Talk Stats Forum - Biostatistics
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Epidemiology and biostatistics, public health research. GLM, logistic regression, survival analysis, clinical trials.enTue, 02 Sep 2014 06:41:46 GMTvBulletin60http://www.talkstats.com/images/misc/rss.pngStatistics Help @ Talk Stats Forum - Biostatistics
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Help with power calculation!?
http://www.talkstats.com/showthread.php/57457-Help-with-power-calculation!?goto=newpost
Mon, 01 Sep 2014 18:48:36 GMTHi, I have a dataset on a cohort of patients with fixed number of subjects. I have a primary outcome and a primary exposure. If I want to do a...Hi, I have a dataset on a cohort of patients with fixed number of subjects. I have a primary outcome and a primary exposure. If I want to do a statistical analysis on this cohort, prior to that how could I calculate the power of my study? From the cohort I know the prevalence of the outcome. Could someone lead me to the right web-link
Thanks

sample size 28350
Of the whole population 10.4% have the outcome, 89.6% don't.
Of those with the main exposure, 12% have the outcome of those without the main exposure 10%.
]]>Biostatisticsleilafghttp://www.talkstats.com/showthread.php/57457-Help-with-power-calculation!Incidence rate and Kaplan Meier
http://www.talkstats.com/showthread.php/57453-Incidence-rate-and-Kaplan-Meier?goto=newpost
Mon, 01 Sep 2014 13:24:05 GMTHello,

I have a question about what we call "incidence rate" at the end of a longitudinal study.
If there are a number of censored data, how do you calculate this IR.
Is that the same calculation as Kaplan Meir estimate at the end of the study, or there is another way to calculate it?
Thanks a lot for your help!
]]>Biostatisticsdidyehttp://www.talkstats.com/showthread.php/57453-Incidence-rate-and-Kaplan-Meier