How do you compare parametric and non-parametric analysis?

How do you compare parametric and non-parametric analysis?
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Answer :

In parametric analysis the underlying distributions of thevariables are described by parameters. These may be known or it maybe possible to estimate them from the observed data. Innon-parametric analyses, the parameters are not used - eitherbecause they cannot be derived or because the tests do not requirethem.
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