PARAMETRIC AND NONPARAMETRIC TEST. Parametric Test  If the information about the population is completely known by means of its parameters then statistical.

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Presentation transcript:

PARAMETRIC AND NONPARAMETRIC TEST

Parametric Test  If the information about the population is completely known by means of its parameters then statistical test is called parametric test  Eg: t- test, f-test, z-test, ANOVA

Nonparametric test  If there is no knowledge about the population or paramters, but still it is required to test the hypothesis of the population. Then it is called nonparametric test  Eg: mann-Whitney, rank sum test, Kruskal-Wallis test

Classification Of hypothesis Parametric test Non Parametric test t- test, f-test, z-test, ANOVA mann-Whitney, rank sum test, Kruskal-Wallis test

Difference between parametric and Non parametric ParametricNon Parametric Information about population is completely known No information about the population is available Specific assumptions are made regarding the population No assumptions are made regarding the population Null hypothesis is made on parameters of the population distribution The null hypothesis is free from parameters

Difference between parametric and Non parametric ParametricNon Parametric Test statistic is based on the distributionTest statistic is arbritary Parametric tests are applicable only for variable It is applied both variable and artributes No parametric test excist for Norminal scale data Non parametric test do exist for norminal and ordinal scale data Parametric test is powerful, if it existIt is not so powerful like parametric test

Advantages of non parametric test  Non parametric test are simple and easy to understand  It will not involve complecated sampling theory  No assumption is made regarding the parent population  This method is only available for norminal scale data  This method are easy applicable for artribute dates.

Disadvantages of non parametric test  it can be applied only for norminal or ordinal scale  For any problem, if any parametric test exist it is highly powerful.  Nonparametric methods are not so efficient as of parametric test  No nonparametric test available for testing the interaction in analysis of variance model.

Thank you....