Casio FX-CG10 Software User Guide - Page 218
Estimated Value Calculation for Regression Graphs
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Σ • Power Regression MSe = 1 n - 2 n i=1 (ln yi - (ln a + b ln xi ))2 Σ • Sin Regression MSe = 1 n - 2 n i=1 (yi - (a sin (bxi + c) + d ))2 Σ • Logistic Regression MSe = 1 n - 2 n i=1 yi - 1 C + ae-bxi 2 u Estimated Value Calculation for Regression Graphs The Statistics mode also includes a Y-CAL function that uses regression to calculate the estimated y-value for a particular x-value after graphing a paired-variable statistical regression. The following is the general procedure for using the Y-CAL function. 1. After drawing a regression graph, press !5(G-SOLVE)1(Y-CAL) to enter the graph selection mode, and then press w. If there are multiple graphs on the display, use f and c to select the graph you want, and then press w. • This causes an x-value input dialog box to appear. 2. Input the value you want for x and then press w. • This causes the coordinates for x and y to appear at the bottom of the display, and moves the pointer to the corresponding point on the graph. 3. Pressing v or a number key at this time causes the x-value input dialog box to reappear so you can perform another estimated value calculation if you want. • The pointer does not appear if the calculated coordinates are not within the display range. • The coordinates do not appear if "Off" is specified for the "Coord" item of the Setup screen. 6-25