[R] Odds Ratio for evaluating Diagnostic tests

Hi friends, I have a doubt reg the application of odds ratio. When evaluating a diagnostic test, what odds ratio I should apply? When I use.. *>oddsratio (X)** * the OR I get is not ad/bc. Thank you. Regards, Dr Manoj Aravind, PG Resident, Dept of Community Medicine, Osmania Medical Coll

[R] Problem applying Chi-square in R and Cochran's Recommendations

x27;s Recommendations. * R says " chi squared approximation may be incorrect." Does it mean the same as what EpInfo saying " Chi square is not valid" Regards, Dr. B. Manoj Aravind. *Table for analysis* Number of STDs Identified Type of Health worker &

Re: [R] Problem applying McNemar's - Different values in SPSS and R

Thank you Marc :) It Certainly helped me to get the exact value of P. How to understand when to apply mcnemar.exact or just mcnemar.test? I'm a beginner to biostatistics. Manoj Aravind On Tue, Dec 28, 2010 at 11:00 PM, Marc Schwartz wrote: > > On Dec 28, 2010, at 11:05 AM, Manoj Ar

[R] Problem applying McNemar's - Different values in SPSS and R

ot;,"NE"), + "HSC"=c("ABN","NE"))) > tvshsc HSC TVS ABN NE ABN 40 3 NE 11 7 > mcnemar.test(tvshsc) McNemar's Chi-squared test with continuity correction data: tvshsc McNemar's chi-squared = 3.5, df = 1, p-va