Texas Instruments TI-89 User Manual - Page 548
Statistical Variables, Technical Reference, Memory and Variable
UPC - 033317196326
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Calc Type QuartReg SinReg Description Quartic regression - Fits the data to the fourth-order polynomial y=ax4+bx3+cx2+ dx+e. You must have at least five data points. • For five points, the equation is a polynomial fit. • For six or more points, it is a polynomial regression. Sinusoidal regression - Calculates the sinusoidal regression and updates all the system statistics variables. The output is always in radians, regardless of the angle mode setting. Note: For TwoVar and all regression calculations, the columns that you specify for x and y (and optionally, Freq or Category) must have the same length. From the Home Screen or a Program Use the applicable command for the calculation that you want to perform. The commands have the same name as the corresponding Calculation Type. Refer to the Technical Reference module for information about each command. Important: These commands perform a statistical calculation but do not automatically display the results. Use the ShowStat command to show the calculation results. Statistical Variables Statistical calculation results are stored to variables. To access these variables, type the variable name or use the VAR-LINK screen as described in Memory and Variable Statistics and Data Plots 548