How to calculate r squared in linear regression?

R-squared correlation is an important statistical measure which in a regression model represents the proportion of the difference or variance in statistical terms for a dependent variable which can be explained by an independent variable or variables.

First of all, sort the Y in sample data and Y in result of regression in a file(text file, or excel file or ...) and 2 columns. Then copy and paste these data into R-Squared Calculator. By clicking on "R-Squared" button, you can get r-squared correlation easily.

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