Table 4 Linear regression model series

Variables	Model 0	Model 1	Model 2	Model 3	Model 4
Dependent variables	○	○	○	○	○
Covariates	○	○	○	○	○
Natural variables		○			○
Artificial variables			○		○
Perception variables				○	○

The symbol “○“ indicates that all the variables in this dimension will be incorporated into the model.

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