HP 40G manual Defining a regression model 2VAR, Insert data Sort data values, To choose the fit

Insert data

Sort data values

Highlight the entry following the point of insertion. Press ,16_, then enter a number. It will write over the zero that was inserted.

1.In Numeric view, highlight the column you want to sort, and press 6257_.

2.Select the SORT ORDER option. You can choose either

Ascending or Descending.

3.Specify the INDEPENDENT and DEPENDENT data columns. Sorting is by the independent column. For instance, if Age is C1 and Income is C2 and you want to sort by Income, then you make C2 the independent column for the sorting and C1 the dependent column.

–To sort just one column, choose None for the dependent column.

–For one-variable statistics with two data columns, specify the frequency column as the dependent column.

4.Press 2._.

Defining a regression model (2VAR)

The Symbolic view includes an expression (Fit1 through Fit5) that defines the regression model, or “fit”, to use for the regression analysis of each two-variable data set.

There are three ways to select a regression model:

•Accept the default option to fit the data to a straight line.

•Select one of the available fit options in Symbolic Setup view.

•Enter your own mathematical expression in Symbolic view. This expression will be plotted, but it will not be fitted to the data points.

To choose the fit

1.In Numeric view, make sure ￿9$5￿_is set.

2.Press >6+,)7@SETUP-SYMBto display the Symbolic Setup view. Highlight the Fit number (S1FIT to S5FIT) you want to define.

3.Press &+226_and select from the following list. Press 2._ when done. The regression formula for the fit is displayed in Symbolic view.

Statistics aplet 8-11