Texas Instruments TI-82 User Manual - Page 169
Types of Statistical Analysis
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Types of Statistical Analysis The SET UP CALCS settings are used for statistical analyses. You can override SET UP CALCS settings by specifying the name(s) of the list(s) and frequency after the statistical calculation instruction (Appendix A). 1-Var Stats 1-Var Stats (one-variable statistics, STAT CALC item 1) calculates statistical variables as indicated on the previous page. 2-Var Stats 2-Var Stats (two-variable statistics, STAT CALC item 2) calculates statistical variables as indicated on the previous page. Med.Med Med.Med (median-median, STAT CALC item 4) fits the data to the model y=ax+b using the median-median line (resistant line) technique, calculating the summary points x1, y1, x2, y2, x3, and y3. It displays a (slope) and b (y-intercept). LinReg (ax+b) LinReg (ax+b) (linear regression, STAT CALC item 5) fits the data to the model y=ax+b using a least-squares fit and x and y. It displays a (slope), b (y-intercept), and r (correlation coefficient). QuadReg QuadReg (quadratic regression, STAT CALC item 6) fits the data to the second-order polynomial y=ax2+bx+c. It displays a, b, and c. For three points the equation is a polynomial fit; for four or more, it is a polynomial regression. At least three points are required. CubicReg CubicReg (cubic regression, STAT CALC item 7) fits the data to the thirdorder polynomial y=ax3+bx2+cx+d. It displays a, b, c, and d. For four points the equation is a polynomial fit; for five or more, it is a polynomial regression. At least four points are required. QuartReg QuartReg (quartic regression, STAT CALC item 8) fits the data to the fourth-order polynomial y=ax4+bx3+cx2+dx+e. It displays a, b, c, d, and e. For five points the equation is a polynomial fit; for six or more, it is a polynomial regression. At least five points are required. Statistics 12-15