After determining the parameters of multiple linear regression in TI-84 (which do not have any direct built-in function support of this calculation), the coefficient of determination can also be easily calculated using the rich set of list functions supported by TI-84. Following the previous example, the dependent variable is in Sales list, the other two independent variables are Size and Dist lists.
The Yhat list is to be prepared first. This lists store the predicted values using the regression parameters determined in the previous installment.
Next, the mean of Y and Yhat are calculated and stored to a handy list S.
Furthermore, three lists SYY, SYhYh, SYYh are calculated respectively.
The result is obtained by the formula below.