# Multiple Correlation Coefficient Calculator

Instructions: Use this Multiple Correlation Coefficient Calculator for a multiple linear regression. Please input the data for the independent variables $$(X_i's)$$ and the dependent variable ($$Y$$), in form below, and the step-by-step calculations will be shown:

Dependent variable sample data ($$Y$$, comma or space separated) =
X values (comma or space separated, press '\' for a new variable)
Independent variable Names (Comma separated. Optional) =
Dependent variable Name (optional) =

## Multiple Correlation Coefficient

The multiple correlation coefficient is a numerical measure of how well a linear regression model fits a set of data $$Y_i$$.

Technically speaking, it is the simple correlation coefficient for dependent variable values $$Y_i$$ and the predicted values $$\hat Y_i$$ that are obtained with the least squares multiple linear regression

Mathematically,

$R_{mult} =\frac{n \sum_{i=1}^n hat Y_i Y_i - \left(\sum_{i=1}^n \hat Y_i \right) \left(\sum_{i=1}^n Y_i \right) }{\sqrt{n \sum_{i=1}^n \hat Y_i^2 - \left( \sum_{i=1}^n \hat Y_i \right)^2} \sqrt{n \sum_{i=1}^n Y_i^2 - \left( \sum_{i=1}^n Y_i \right)^2} }$

but it can also be computed $$\sqrt{\frac{SSR}{SST}}$$, where $$SSR$$ is the sum of regression squares and $$SST$$ is the total sum of squares, because that way is a bit simpler by following some (intensive) matrix calculations .

### What are the limits of multiple correlation coefficient?

For the case of a simple linear regression, the correlation coefficient may range from -1 to 1. For the case of the multiple correlation coefficient, it ranges from 0 to 1.

### Other associated calculators If you need to estimate the regression model instead, you can use this multiple linear regression calculator.

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