Texas Instruments TI89TITANIUM User Manual - Page 543
Specify applicable settings for the active items., Description, Calculation Types, OneVar
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2. Specify applicable settings for the active items. Item Description Calculation Type Select the type of calculation. x Type the column number in the Data/Matrix Editor (C1, C2, etc.) used for x values, the independent variable. Y Type the column number used for y values, the dependent variable. This is required for all Calculation Types except OneVar. Store RegEQ to If Calculation Type is a regression analysis, you can select a function name (y1(x), y2(x), etc.). This lets you store the regression equation so that it will be displayed in the Y= Editor. Use Freq and Categories? Select NO or YES. Note that Freq, Category, and Include Categories are active only when Use Freq and Categories? = YES. Freq Type the column number that contains a "weight" value for each data point. If you do not enter a column number, all data points are assumed to have the same weight (1). Category Type the column number that contains a category value for each data point. Include Categories If you specify a Category column, you can use this item to limit the calculation to specified category values. For example, if you specify {1,4}, the calculation uses only data points with a category value of 1 or 4. Statistics and Data Plots 543