The Pearson productmoment correlation coefficient is a statistical measurement of the correlation (linear association) between two sets of values.
The Pearson productmoment correlation coefficient for two sets of values, x and y, is given by the formula:
where x and y are the sample means of the two arrays of values.
The Excel RSQ Function returns the square of the above r value.The Excel RSQ function calculates the square of the Pearson ProductMoment Correlation Coefficient for two supplied sets of values.
The format of the function is:
Where known_y's and known_x's are two arrays of numeric values that are of equal length.
Note that if any of the values in the known_y's or known_x's arrays are text values, logical values, or refer to empty cells, these values are excluded from the Rsq function calculation.
A  B  

1  known y's  known x's 
2  2  22.90 
3  7  33.49 
4  8  34.50 
5  3  27.61 
6  4  19.5 
7  1  10.11 
8  6  37.90 
9  5  31.08 
Columns A and B of the above spreadsheet on the right contain two arrays of values.
The square of the Pearson ProductMoment Correlation Coefficient of the values in columns A and B of the spreadsheet can be calculated using the Excel Rsq function, as follows:
This gives the result 0.71166629.
Note that this result is the square of 0.843603159, which is the Pearson ProductMoment Correlation Coefficient for the two arrays of values.
Further examples of the Excel Rsq function are provided on the Microsoft Office website.
If you get an error from the Excel Rsq function this is likely to be one of the following:
#N/A    Occurs if the supplied known_y's and known_y's arrays have different lengths. 
#DIV/0!    Occurs if either:
