Q: What is nonparametric classifier?

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Yes, Chis squared test are among the most common nonparametric statistics tests.

an OCA previously classified

Nonparametric tests are sometimes called distribution free statistics because they do not require that the data fit a normal distribution. Nonparametric tests require less restrictive assumptions about the data than parametric restrictions. We can perform the analysis of categorical and rank data using nonparametric tests.

If the distribution is parametric then yes.

When the variable that is being tested has an unknown distribution.

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Classifier is an abstract UML metaclass to support classification of instances according to their features. Classifier describes a set of instances that have common features. A feature declares a structural (properties) or behavioral (operations) characteristic of instances of classifiers.More formally, in UML 2.2 Classifier is (extends):NamespaceTypeRedefinable ElementNamespace is an element in a model that can own (contain) other named elements. As a Namespace, classifier can have features.Type represents a set of values. A typed element that has this type is constrained to represent values within this set. As a Type, classifier can own generalizations, thereby making it possible to define generalization relationships to other classifiers.Redefinable Element is an element that, when defined in the context of a classifier, can be redefined more specifically or differently in the context of another classifier that specializes (directly or indirectly) the context classifier. As a Redefinable Element, it is possible for classifier to redefine nested classifiers.Some examples (subclasses) of Classifiersin UML 2.2 are:ClassInterfaceAssociationDataTypeActor (subclass of Behaviored Classifier)Use Case (subclass of Behaviored Classifier)ArtifactComponent (subclass of Class)Signal

A paired samples t-test is an example of parametric (not nonparametric) tests.

Yes, Chis squared test are among the most common nonparametric statistics tests.

Gregory W. Corder has written: 'Nonparametric statistics for non-statisticians' -- subject(s): Nonparametric statistics

Yes, the word 'classifier' is a noun, a word for one who classifies (a person); a word for a device for separating solids of different characteristics (a thing).

Sidney Siegel has written: 'Nonparametric statistics for the behavorial sciences.' 'Bargaining and group decision making' 'Nonparametric ststistics for the behavioral sciences'

an OCA previously classified

Richard A. Tapia has written: 'Nonparametric probability density estimation' -- subject(s): Distribution (Probability theory), Estimation theory, Nonparametric statistics

c2 (Chi Square)

Hulin Wu has written: 'Nonparametric regression methods for longitudinal data analysis' -- subject(s): Longitudinal method, Mathematical models, Nonparametric statistics