REGRESSION Logarithmic Regression (Page 1 of 2)

As a last example we will find a logarithmic regression model, which will be based on the natural logarithmic function. The process is similar to the previous models. Since the data is already entered and graphed, all we need to do is compute the model. It is called LnReg, and it is also located in the STAT CALC submenu. Enter the command, followed by the lists that contain the x-values (L1) and y-values (L2).

 2nd QUIT key. CLEAR key.

 STAT key. [CALC] Up arrow key. 9: menu selection. 2nd L1 key. Comma key.
 2nd L2 key. Comma key. VARS key. [Y-VARS] 1: menu selection. 1: menu selection.
 ENTER key.

 Calculator screen image. Calculator screen image.

The general form of the model is shown, as well as the values of each parameter used in the model (a and b). For this example, the equation is y = -11.867+18.148lnx. The correlation coefficient r and the coefficient of determination r-squared are also displayed.
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