## (“Sigma Line”)

'expr'## Not in HP-28

Keyboard Access:HP48S: RS-STAT NXT LS-STAT NXT NXT HP48G: LS-STAT FIT HP49/50: 102 MENURegression Model Formula command. Returns an algebraic expression representing the best fit line according to the currently selected statistical model, using as the independent variable name, and explicit values of the slope and intercept taken from the reserved variable .For the following statistical models, the following forms are returned:

where b is the intercept, m is the slope, and x is the independent variable.Example: If the currently selected statistics model is , and if the data in has a slope of 5 and an intercept of 3 (as calculated by ), then returns .

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