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Free statistics help forum. Discuss statistical research, data analysis, statistics homework questions, R, SAS, Stata, SPSS, and more.enThu, 25 Aug 2016 16:08:22 GMTvBulletin60http://www.talkstats.com/images/misc/rss.pngStatistics Help @ Talk Stats Forum
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conditional probability
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Thu, 25 Aug 2016 15:15:46 GMTFor a combined ELISA-Western blot blood test for HIV positive status, the sensitivity P(positive test |HIV) is about 0.999 and the specificity...For a combined ELISA-Western blot blood test for HIV positive status, the sensitivity P(positive test |HIV) is about 0.999 and the specificity P(negative Test | not HIV) is about 0.9999.

Consider a high risk group in which 10% are truly HIV positive. Construct a tree diagram to summarize this diagnostic test

I don't even know how to start. I've watched so many youtube videos and I'm still lost
]]>ProbabilityRachelCrowleyhttp://www.talkstats.com/showthread.php/66237-conditional-probabilityIncidence rate in population and in random sample
http://www.talkstats.com/showthread.php/66236-Incidence-rate-in-population-and-in-random-sample?goto=newpost
Thu, 25 Aug 2016 15:09:38 GMTHow can I anser a question like the following:

When the true incidence rate of an event in the population is "X" (say, 12%), how likely is it that the event is observed at least once in a random sample of "Y" (say, 250) subjects drawn from this population?

Thank you very much!
]]>ProbabilityAVoelphttp://www.talkstats.com/showthread.php/66236-Incidence-rate-in-population-and-in-random-sample<![CDATA[I need advice on Fisher's exact test]]>
http://www.talkstats.com/showthread.php/66235-I-need-advice-on-Fisher-s-exact-test?goto=newpost
Thu, 25 Aug 2016 08:58:28 GMTI recently submitted a paper and in my study, I wanted to see if there is an association between a gene mutation and the absence/presence of the...I recently submitted a paper and in my study, I wanted to see if there is an association between a gene mutation and the absence/presence of the expression of another gene in 14 cancer cell lines. I used the Fisher's exact test because to my knowledge, it's used for the relationship between two categorical variables but I was told by the reviewer that this test is not appropriate. I wonder if anyone could help me with this. Thank you.
]]>BiostatisticsCoralhttp://www.talkstats.com/showthread.php/66235-I-need-advice-on-Fisher-s-exact-test