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Using the fitlm function for model without intercept, how R-squared is being calculated?

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Farhad Balali 2018-7-17

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评论： Shuqi Liu 2021-7-19

The value of the R-squared when I define the linear model without intercept are mostly negative and somehow close to -3. When I apply the fitlm function for model without intercept, the R-squared values are between 0 and 1. Does anyone know which formula Matlab is using in this case?

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Shuqi Liu 2021-7-19

Also when using fitlm without intercept, the Rsquared comptued by fitlm is different using Matlab 2020a and prior vs 2020b. Does anyone knows why did it change?

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Rishabh Gupta 2018-7-27

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Hi Farhad,

There are 2 types of R-squared values -

Ordinary R-Squared
Adjusted R-Squared

You can have a look at the formula in the below Link:

https://www.mathworks.com/help/stats/coefficient-of-determination-r-squared.html

Regards

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Pulkit Goyal 2020-4-8

This page doesn't explain the R-squared definitions when intercept is forced to zero.

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