3. Fit data..

Level 3 shows the form of the equation. Level 2 shows the sample correlation coefficient, and level 1 shows the covariance of x-y. For definitions of these parameters see Chapter 18 in the user’s guide.

For additional information on the data-fit feature of the calculator see Chapter 18 in the user’s guide.

Obtaining additional summary statistics

The application 4. Summary stats.. in the STAT menu can be useful in some calculations for sample statistics. To get started, press ‚Ù once more, move to the fourth option using the down-arrow key ˜, and press @@@OK@@@. The resulting input form contains the following fields:

ΣDAT: the matrix containing the data of interest.

X-Col,Y-Col:these options apply only when you have more than two columns in the matrix ΣDAT. By default, the x column is column 1, and the y column is column 2. If you have only one column, then the only setting that makes sense is to have

X-Col: 1.

_ΣX _ ΣY…: summary statistics that you can choose as results of this program by checking the appropriate field using [3CHK] when that field is selected.

Many of these summary statistics are used to calculate statistics of two variables (x,y) that may be related by a function y = f(x). Therefore, this program can be thought off as a companion to program

As an example, for the x-y data currently in ΣDAT, obtain all the summary statistics.

•To access the summary stats… option, use: ‚Ù˜˜˜@@@OK@@@

•Select the column numbers corresponding to the x- and y-data, i.e., X-Col: 1, and Y-Col: 2.

•Using the @3CHK@ key select all the options for outputs, i.e., _ΣX, _ΣY, etc.

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