Читать книгу The Big R-Book - Philippe J. S. De Brouwer - Страница 284

Chi-square test is a statistical method to determine if two categorical variables have a significant correlation between them. Both those variables should be from same population, and they should be categorical like “Yes/No,” “Male/Female,” “Red/Amber/Green,” etc.

test – chi square

For example, we can build a dataset with observations on people’s ice-cream buying pattern and try to correlate the gender of a person with the flavour of the ice-cream they prefer. If a correlation is found, we can plan for appropriate stock of flavours by knowing the number of gender of people visiting.