A Brief Description of Non-Parametric Tests
Non-parametric Tests In adverse to parametric tests, non-parametric tests do not crave any assumptions about the ambit or about the attributes of population. It is because of this that these methods are sometimes referred to as the administration chargeless methods. Best of these methods, however, are based aloft the weaker assumptions that observations are absolute and that the capricious beneath abstraction is connected with about balanced distribution. In accession to this, these methods do not crave abstracts as able as that appropriate by parametric methods.
Most of the non- arametric tests are applicative to abstracts abstinent in an cardinal or nominal scale. As against to this, the parametric tests are based on abstracts abstinent at atomic in an breach scale. The abstracts acquired on breach and arrangement calibration are additionally accepted as aerial akin measurements. Akin of altitude 1 . Nominal scale: This calibration uses numbers or alternative symbols to analyze the groups or classes to which assorted altar belong. These numbers or symbols aggregate a nominal or classifying scale.
For example, allocation of individuals on the base of sex (male, female) or on the base of akin of apprenticeship (matric, chief secondary, raduate, column graduate), etc. This calibration is the weakest of all the measurements. 2. Cardinal scale: This calibration uses numbers to represent some affectionate of acclimation or baronial of objects. However, the differences of numbers, acclimated for ranking, don't accept any meaning. For example, the top 4 acceptance of chic can be ranked as 1, 2, 3, 4, according to their marks in an examination. 3.
Interval scale: This calibration additionally uses numbers such that these can be ordered and their differences accept a allusive interpretation. 4. Arrangement scale: A calibration possessing all the backdrop of an breach calibration forth with a accurate aught point is alleged a arrangement scale. It may be acicular out that a aught point in an breach calibration is arbitrary. For example, freezing point of baptize is authentic at 00 Celsius or 320 Fahrenheit, implying thereby that the aught on either calibration is approximate and doesn't represent absolute absence of heat.
In adverse to this, the altitude of distance, say in metres, is done on a arrangement scale. The appellation arrangement is acclimated actuality because arrangement comparisons are meaningful. For example, 100 kms of ambit is four times beyond than a ambit of 25 kms while 1000F may not beggarly that it is alert as hot as SOOF. It should be acclaimed actuality that a analysis that can be erformed on aerial akin abstracts can consistently be performed on cardinal or nominal abstracts but not vice-versa.
However, if forth with the aerial akin abstracts the altitude of a parametric analysis are additionally met, the parametric analysis should consistently be acclimated because this analysis is best able in the accustomed circumstances. From the above, we achieve that a non-parametric analysis should be acclimated back either the altitude about the ancestor citizenry are not met or the akin of abstracts is bare for a parametric test. References: http://classofl . com/homework-help/statistics-homework-help/
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