According to Nguyen Thong et al (2000). Check the fit of the model is the consideration of the independent variables included in the model were not appropriate. To perform additional tests on the suitability of the model, we use Fisher test and the steps are as follows:
- Step 1: Place the hypothesis
H0: β1 = β1 = ... = βk = 0: regression model mismatch.
H1: There exists at least one βj ≠ 0: fit regression model.
- Step 2: Calculate the value of fstat statistic for the model, using the following formula:
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