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Nonparametric statistics for the behavioral sciences Sidney Siegel
Publisher: McGraw-Hill

Practical Nonparametric Statistics. New York: McGraw-Hill; 1956:75-83. Anything else is non-parametric. There are two types of social research data: parametric and non-parametric. Nonparametric Methods for the Behavioral Sciences. Normal distribution which allows for more conclusions to be drawn as the shape can be mathematically described. Statistical Cohen J: Statistical Power Analysis for the Behavioral Sciences. Unlike parametric person-fit statistics, nonparametric person-fit statistics do not require fitting a parametric test theory model. Alternatives might either rely on using non-parametric statistical tests or only on comparing the confidence intervals without any statistical tests [5]. Psychological Bulletin 74 (1970):138-140. Siegel S: Non-parametric Statistics for the Behavioral Sciences.