RESULTS
Independent variable selection ITE provided suggestions for independent variable
selection which included: 1) logical relationship to site trip generation, 2) value measured directly for the survey site, 3) those used in similar trip generation land uses, and 4) confidence that the available site data were accurate. To identify logical relationships, a correlation coefficient was used. The correlation coefficient is a measure of linear association between two variables. Values of the correlation coefficient are always between -1 and +1 (Kattor et al., 2013). A correlation coefficient of +1 means that the two variables are perfectly related in a positive linear sense, a correlation coefficient of -1 means that the two variables are perfectly related in a negative linear sense, and a correlation coefficient of 0
means that there is no linear relationship between the two variables. The correlation between each of the independent variables with the dependent variable is shown in Table
2. A correlation matrix shows the correlation between each pair of variables. The diagonal of the matrix has values of 1 because a variable always has a perfect correlation with itself. The magnitude of the correlation coefficient determines the strength of the correlation.