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Probability course and homework discussion. Probability distributions. Probability theory, stochastic processesenWed, 28 Jan 2015 14:10:31 GMTvBulletin60http://www.talkstats.com/images/misc/rss.pngStatistics Help @ Talk Stats Forum - Probability
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Calculating Sensitivity and Specificity of Combined Testing...With a Surprise.
http://www.talkstats.com/showthread.php/59328-Calculating-Sensitivity-and-Specificity-of-Combined-Testing...With-a-Surprise.?goto=newpost
Tue, 27 Jan 2015 18:49:20 GMTOk guys. I have an interesting question.

I'm a biomedical engineering student from Georgia Tech and for one of my classes I have to implement screening policy for liver cancer. I decided to implement combined testing. It looks like this

Test A
High risk factor - - Test C
Test B

I have a series of tests, and the first tests are in parallel. If the patient passes test A or B, they move on to Test C. I can calculate the sensitivity and specificity of this system, given the sensitivities and specificity of each test, that's no problem. My problem comes after Test C.

If Test C comes out negative, I have the patient do the screening process again. In which case if he passes the parallel tests and then fails Test C again I consider him negative, so it loops only once. How can I take this into account?

I'm looking at sensitivities and specificity, so I think the prevalence of the disease don't matter. I'm assuming, of course, that each test has the same sensitivity and specificity a second time.

Help would be greatly appreciated!
]]>ProbabilityErikSampayohttp://www.talkstats.com/showthread.php/59328-Calculating-Sensitivity-and-Specificity-of-Combined-Testing...With-a-Surprise.Acceptance Testing - Calculating Type 1 and Type 2 Errors
http://www.talkstats.com/showthread.php/59326-Acceptance-Testing-Calculating-Type-1-and-Type-2-Errors?goto=newpost
Tue, 27 Jan 2015 06:51:44 GMTLots of forty components each are called acceptable if they contain no more than five defectives. The decision procedure is to inspect components...Lots of forty components each are called acceptable if they contain no more than five defectives. The decision procedure is to inspect components drawn at random until a defective one is found. If this occurs in the first six tries the lot is rejected. If the first six components drawn are non-defective, the lot is passed. Find the maximum probability that a non-acceptable lot will be passed. Find the maximum probability that an acceptable lot is rejected.

I believe that this is the probability that a defective component will be drawn:

I am stuck on how use this distribution to calculate the type 1 and type 2 errors. Any help will be appreciated. Thank you.
]]>Probabilitybluejayhttp://www.talkstats.com/showthread.php/59326-Acceptance-Testing-Calculating-Type-1-and-Type-2-ErrorsWhen are you using: Bayes or discriteet or norminal
http://www.talkstats.com/showthread.php/59305-When-are-you-using-Bayes-or-discriteet-or-norminal?goto=newpost
Sun, 25 Jan 2015 23:55:16 GMTWHEN ARE YOU USING: BAYES OR DISCRITEET (BIO) OR NORMINAL (CONTINU) PROPABILITY?
THE FORMULES ARE WRITTEN IN MY TEXTBOOK and i understand the...WHEN ARE YOU USING: BAYES OR DISCRITEET (BIO) OR NORMINAL (CONTINU) PROPABILITY?

THE FORMULES ARE WRITTEN IN MY TEXTBOOK and i understand the formules.
BUT I AM BAD AT PICKING THE RIGHT ONE to answer A QUESTION

What are considerations that I should make in my method or technique choice?
For calculating the propability.

excuse me for the caps!
]]>Probabilityozkanhttp://www.talkstats.com/showthread.php/59305-When-are-you-using-Bayes-or-discriteet-or-norminal