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Fig. 7.6 Dialogue Box for SAT vs. FROSH GPA Correlations
7.4 Using Excel to Create a Correlation Matrix
in Multiple Regression
The final step in multiple regression is to find the correlation between all of the
variables that appear in the regression equation.
In our example, this means that we need to find the correlation between each of
the six pairs of variables:
To do this, we need to use Excel to create a “correlation matrix.” This matrix
summarizes the correlations between all of the variables in the problem.
Objective : To use Excel to create a correlation matrix between
the four variables in this example.
To use Excel to do this, use these steps:
Data (top of screen under “Home” at the top left of screen)
Data Analysis
Correlation (scroll up to highlight this formula; see Fig. 7.6 )
OK
Input range: A6: D17
(Note that this input range includes the labels at the top of the FOUR variables
(FROSH GPA, READING SCORE, WRITING SCORE, MATH SCORE) as
well as all of the figures in the original data set.)
Grouped by: Columns
Put a check in the box for: Labels in the First Row (since you included the labels at
the top of the columns in your input range of data above)
Output range (click on the button to its left, and enter): A42 (see Fig. 7.7 )
OK
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