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procedures used in field work performed to determine container densities. He called up the next speaker to explain the statistical analysis. Barbara Stevens advised that they had used the technique called multiple regression analysis, a fairly complicated statistical technique, to determine container densities. She explained the regression equation and covered Table 3-1, Initial Regrouping for Regression Analysis, and Table 3-2, Coefficients and Statistical Iterations. She concluded that the final equation explains over 92% of all the variation in container density, that is, that two factors, is it restaurant and manufacturing or isn't it, will give an explanation of more than 92% of the total variation in container density. They were pleased with the results and felt they were highly defensible and give a very good handle and methodology for proceeding to estimate the waste generated by commercial establishments. (CLERK'S NOTE: Chairman Macht left the meeting on a family emergency at approximately 10:31 a.m.) Mr. Gutner explained what makes up waste generation estimates. Essentially what they found was what type of business determined what type of waste. He described the factors in the equation used to calculate the assessment factor. He illustrated data used for each use code and clarified the correlation between the waste generation and square footage for each establishment. Mr. Gutner concluded that there is a distinct correlation between waste generation and square footage and the strength of that association varies a little, among different establishments. They found that over 80% of the in-place assessments were very close when compared with the factors they calculated independently. They believe that categories need to be reviewed further because of some variability in the data which may be explainable through additional data. He commented on the under -assessed and over - assessed categories and suggested shopping centers receive additional review. Mr. Gutner concluded by reviewing and explaining their recommendations and conclusions, namely: 1) review of the use codes in certain categories; 2) database should be refined and updated regularly; and 3) the dispute methodology should be expanded and additional considerations for appeal might include: property assessed under incorrect category; waste generated significantly 9 January 31, 1995 ROOK 94 f,A1je V207