Correlation analysis of Nominal data with Chi-Square Test in Data Mining

Correlation analysis of Nominal data with Chi-Square Test in Data Mining

Chi-Square Test

This analysis can be done by the chi-square test.A chi-square test is the test to analyze the correlation of nominal data.

Correlation VS Causality:

Correlation does not always tell us about causality.

Example:

• The number of students passed in exam and number of car theft in a country is correlated with each other but maybe it does not mean that the number of students passed effects car theft in a country.

But in some cases it may be;

• The number of students passed in the exam and the number of students who live near to the university is correlated with each other and maybe a number of students who live near to the university can be a cause of the student result.

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Degrees of freedom:

DF = (r – 1) * (c – 1)

Level of significance:

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