So the formula I use is (sample/600) ^ 0.5. ... These large sample size polls now have a comparatively larger weight, and as such Obama’s numbers have dropped a couple points in Texas, ...

Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

If the bias is large, the sample size would be small. If the bias is very small, the sample size will be large, as can be seen from the equation. This seems to be the opposite of what industry wants ...

Woolson, Bean, and Rojas (1986, Biometrics 42, 927-932) present a simple approximation of sample size for Cochran's (1954, Biometrics 10, 417-451) test for detecting association between exposure and ...

Sample size calculations can be made for common study designs such as one test in ... and Baldock, F. C. (1998), "A New Probability Formula for Surveys to Substantiate Freedom from Disease," ...

When particles in a sample are the same size, one particle can be measured to report the result. If the sample has a narrow distribution, such as 10-25 µm, then measurement of just a few particles can ...