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Figure 4.9 Graphs of 1 + 2x1 – x2 + x1x2 for x2 = 0,1,2

Figure 4.9 Graphs of 1 + 2x1 – x2 + x1x2 for x2 = 0,1,2

Tải bản đầy đủ - 65trang

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Figure 4.10 Examples of nointeraction and interaction models



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Figure 4.11 MINITAB regression printout

for grandfather clock model with interaction



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Section 4.11

A Quadratic

(Second-Order)

Model with a

Quantitative

Predictor



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Figure 4.12 Graphs for two

quadratic models



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Figure 4.13 SPSS scatterplot for

data of Example 4.7



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Figure 4.14 SPSS output for

quadratic model of Example 4.7



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Figure 4.15 MINITAB graph of least

squares fit for the quadratic model



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Figure 4.16 Potential misuse of

quadratic model



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Figure 4.9 Graphs of 1 + 2x1 – x2 + x1x2 for x2 = 0,1,2

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