Sample Size and Power Calculations using the Noncentral t-distribution
نویسندگان
چکیده
منابع مشابه
Sample size and power calculations using the noncentral t-distribution
Abstract. The standard formulas for sample size and power calculation, as implemented in the command sampsi, make use of a normal approximation to the t-distribution. When the sample sizes are small, this approximation is poor, resulting in overestimating power (or underestimating sample size). One particular situation in which this is likely to be important is the field of cluster randomized t...
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Applications of the Noncentral t–Distribution
The noncentral t–distribution is intimately tied to statistical inference procedures for samples from normal populations. For simple random samples from a normal population the usage of the noncentral t–distribution includes basic power calculations, variables acceptance sampling plans (MIL– STD–414) and confidence bounds for percentiles, tail probabilities, statistical process control paramete...
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ژورنال
عنوان ژورنال: The Stata Journal: Promoting communications on statistics and Stata
سال: 2004
ISSN: 1536-867X,1536-8734
DOI: 10.1177/1536867x0400400205