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Regression Example

# Regression Example - 1 Place data columns with X variables...

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1. Place data columns with X variables to the left of Y. 2. Plot the data using XY scatter(s). Look for extreme data values that are not indicative of the phenomenon being studied. 3. Excel requires numeric values for all cells of each variable. 4. All of the X variables MUST be in adjacent columns. 5. No X variable can be a linear function of other X variables. (i.e. X1 = 10 + X2 + .3*X3)

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Example 9.2, Page 398 Years Salary (\$000) X Y 1 23 2 27 4 29 5 34 6 38 9 46 11 48 14 54 16 54 20 59 22 58 24 59 25 61 27 63 29 59 30 60 0 5 10 15 20 25 30 35 0 10 20 30 40 50 60 70
Slope for S Data ordered by Location & then by Program Independent variables Area # Complaints # of Beds Location Program # of Beds State Rural Urban # of Beds 8 176 3388 Mixed Local 3388 0 0 0 3388 15 273 3117 Mixed Local 3117 0 0 0 3117 18 4 810 Mixed State 810 1 0 0 810 19 17 3292 Mixed State 3292 1 0 0 3292 20 5 356 Mixed State 356 1 0 0 356 1 36 412 Rural Local 412 0 1 0 412 2 22 280 Rural Local 280 0 1 0 280 4 5 650 Rural State 650 1 1 0 650 6 1 1259 Rural State 1259 1 1 0 1259 7 15 820 Rural State 820 1 1 0 820 9 13 582 Rural State 582 1 1 0 582 11 28 648 Rural State 648 1 1 0 648 12 3 1364 Rural State 1364 1 1 0 1364 13 3 494 Rural State 494 1 1 0 494 14 0 475

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