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Tag Archives: Normal Distribution

The Logic Behind Meta-analysis – Fixed-ffect Model


Overview Most meta-analyses are based on one of two statistical models, the fixed-effect model or the random-effects model. Under the fixed-effect model we assume that there is one true effect size (hence the term fixed effect) which underlies all the studies in the analysis, and that all differences in observed effects are due to sampling […]

Basic Concepts in Statistics


Three Kinds of Data There are three types of data, including interval data where some variables are measured on a scale with constant intervals, nominal/categorical data, and ordinal data. For interval data, the absolute difference between two values can always be determined by subtraction. Interval variables include some such as tempterature, blood pressure, height, weight, […]