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How to calculate correlation coefficient Correlation in Excel

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Find out how to calculate correlation coefficient between two data arrays in Microsoft Excel through the CORREL function.

The correlation coefficient (a value between -1 and +1) tells you how strongly two variables are related to each other. We can use the CORREL function or the Analysis Toolpak add-in in Excel to find the correlation coefficient between two variables.

Worked Example:   How to perform a t-Test in Excel

– A correlation coefficient of +1 indicates a perfect positive correlation. As variable X increases, variable Y increases. As variable X decreases, variable Y decreases.

– A correlation coefficient of -1 indicates a perfect negative correlation. As variable X increases, variable Z decreases. As variable X decreases, variable Z increases.

– A correlation coefficient near 0 indicates no correlation.

To use the Analysis Toolpak add-in in Excel to quickly generate correlation coefficients between multiple variables, execute the following steps.

Worked Example:   How To Load Analysis ToolPak in Excel

1. On the Data tab, in the Analysis group, click Data Analysis.

Note: can’t find the Data Analysis button? Click here to load the Analysis ToolPak add-in.

2. Select Correlation and click OK.

3. For example, select the range A1:C6 as the Input Range.

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4. Check Labels in first row.

5. Select cell A8 as the Output Range.

6. Click OK.

Result.

Conclusion: variables A and C are positively correlated (0.91). Variables A and B are not correlated (0.19). Variables B and C are also not correlated (0.11) . You can verify these conclusions by looking at the graph.

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