Agenda - 04-21-1998 - 10b - Laserfiche WebLink

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16' The most important task was to produce an exhibit similar to the one provided by the Illinois School Consulting Service. This information is the population per dwelling unit by age group for all units, for single - family, for apartment units, and for units of different size. The PI had to complete a preliminary analysis to determine the number of owner - occupied dwellings to include in the analysis. Ideally, he wanted to include all units. However, the sample frame for single - family housing was not sufficiently precise to capture only recently built homes. In fact, 37 units surveyed were built before 1985 and 19 before 1975. The results on number of persons and children in the unit were higher for all units than for more recently-built housing, but the differences were very small. This result does support the idea that, on average, household size tends to increase slightly with years of tenure in the house. Difference -of -means tests were run comparing housing with two, three and four bedrooms. The analysis showed that no statistically significant differences exist between all single- family units, the subsample of houses built after 1985 and the subsample of houses build after 1975 for units with the same number of bedrooms. Thus, the PI was able to retain all units in the analysis on the basis of this analysis. The analysis pertains to 216 apartments and 239 single - family units. In fact, eight single- family units are mobile homes (2), condos ( 5 ) or townhouses (1) . The rest are single - family detached units. The PI analyzed these eight records individually and decided to leave them in the sample because their demographic characteristics matched the single - family detached and owner - occupied unit characteristics quite well. Of course, these units tended to be smaller and less valuable than detached single - family housing. All apartment units were rented while seven single - family units were rented. The PI compiled the table of average generation rates from separate analyses of sample subsets. The results are shown in Exhibits 4 and 5. The nine rows give housing type and are listed below with the number of observations (n) for that category: 1) all units (n = 455), 2) all single - family units (n = 239), 3) single - family units with two bedrooms (n = 15 which includes one one - bedroom house), 4) single- family units with three bedrooms (n = 126 which" includes three units not reporting number of bedrooms), 5) single- family units with four (n = 78), five (n-,= 18) or six bedrooms (n =