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Case control study and sample size: >> << (download)
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OpenEpi - Sample Size for Unmatched Case-Control Studies. This module calculates sample size for an unmatched case-control study. You enter the desired confidence level, power, a hypothetical percentage of exposure among the controls, and either an odds ratio or a hypothetical percentage of exposure among the cases.
This utility calculates the sample size required for a case-control study, with specified levels of confidence and power and case and control groups of equal size.
If you are using more than one control per case then this function also provides the reduction in sample size relative to a paired study that you can obtain using
31 Mar 2015 Hello Everyone, I am working in cancer- case control study and I find difficultis in calculationg samples size. This is becasue we do not have an
In this review sample size calculation for most frequently used study designs are wants to calculate sample size for the above-mentioned case control study to
Calculating sample size for a case-control study. Statistical Power. Statistical power is the probability of finding an effect if it's real. Factors Affecting Power. 1.
Power and Sample Size Calculations for Case-Control Studies of Gene-. Environment Interactions with a Polytomous Exposure Variable. Ivo Foppa1 and Donna
19 Nov 2001 Background. Published formulas for case-control designs provide sample sizes required to determine that a given disease-exposure odds ratio
Sample size for a case-control study Example: We wish to conduct a case-control study to assess whether bladder cancer may be associated with past
In planning case-control studies with matched sets, the calculation of exact sample sizes is difficult, because this calculation depends on some nuisance
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