Texas Instruments TI-73VSC Guidebook - Page 148

142 Chapter 7: Statistical Analyses 5. View the line on the Graph screen. (7 The Manual-Fit line, Y1 (previous section). The Med-Med line 6. View the equation stored to Y2, if desired. & Y3 and Y4 may vary. LinReg(ax+b) - v ! 5 LinReg(ax+b) (linear regression) fits the model equation y=ax+b to the data using a least-squares fit. It displays the value for a (slope) and b (y-intercept); when DiagnosticOn is set, it also displays values for r2 (coefficient of determination) and r (correlation coefficient). The DiagnosticOn command is in the CATALOG (-|).You can execute LinReg(ax+b) from the Graph screen, Home screen, or the Program editor. It is also helpful to compare the slope of the line you draw with Manual-Fit to the slope of the line the calculator calculates with the LinReg(ax+b) command. From the Home screen or the Program editor, LinReg(ax+b) accepts four optional arguments. Enter up to two list names, XList and YList; a frequency list, freq; and an equation variable, Yn. freq is the frequency of occurrence for each corresponding data point in XList and YList. If freq is omitted, all values are used once. If XList and YList are not specified, the default list names are L1 and L2. To access Yn variables, press - } 2:Y-Vars. LinReg(ax+b) [XList,YList,freq,Yn]