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Chapter 9 Formula Editor 323
Examples and Tutorials
Figure 9.38 Col Mean
9Formulas
6 Select the entire expression. The red box should now enclose the whole formula.
7 Click the division button ( ) in the keypad. The result gives a selected missing denominator for
the whole expression.
8 Click weight again from the column selector list. It becomes selected in the denominator.
9 Select Col Std Dev from the Statistical list. The completed formula should look like that in
Figure 9.39.
10 Close the formula editor by clicking OK. The new column fills with values. When a weight value
changes, the calculated Standard Weight value automatically recalculates.
Figure 9.39 Building a Formula
Using Local Variables in a Formula
Suppose you want to compute the slope in a simple linear regression of y on x using the standard
formula shown in Figure 9.40. One way to do this is to create two local variables, and name them XY
and Xsqrd. (See “Using Local Variables,” p. 289.) Then assign them to the numerator and the
denominator calculations of the slope formula. Delimit each assignment with a semicolon, as shown in
Figure 9.40. (Statements in the formula editor are actually JSL programming statements. Multiple
statements in a formula must be separated by a semicolons.) The slope computation is simplified to XY
divided by Xsqrd.