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Fig. 7.1
Worksheet Data for SAT versus FROSH GPA (Practical Example)

Then, center all numbers in your table

Important note: Be sure to double-check all of your numbers in your table to be

sure that they are correct, or your spreadsheets will be incorrect.

Save this ﬁle as: GPA15

Before we do the multiple regression analysis, we need to try to make one

important point very clear:

Important:
When we used one predictor, X, to predict one criterion, Y, we said that

you need to make sure that the X variable is ON THE LEFT in your table, and the Y

variable is ON THE RIGHT in your table so that you don’t get these variables

mixed up (see Sect. 6.3).

However, in multiple regression, you need to follow this rule which is exactly the

opposite:

When you use several predictors in multiple regression, it is essential that the

criterion you are trying to predict, Y, be ON THE FAR LEFT, and all of the

predictors are TO THE RIGHT of the criterion, Y, in your table so that you know

which variable is the criterion, Y, and which variables are the predictors. If you

make this a habit, you will save yourself a lot of grief.

Notice in the table above, that the criterion Y (FROSH GPA) is on the far left of

the table, and the three predictors (READING SCORE, WRITING SCORE, and

MATH SCORE) are to the right of the criterion variable. If you follow this rule, you

will be less likely to make a mistake in this type of analysis.

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