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methodology, a logarithmic regression analysis was used3. First, U.S. Census data, specifically, <br />from the American Community Survey (ACS) Public Use Microdata Sample (PUMS) for Lane <br />County were used to establish the average household size by number of bedrooms. The Lane <br />Council of Governments then provided the average total finished square feet (SQ FT) by <br />number of bedrooms based on tax lot data from the Lane County Assessor's Office (2017). <br />Finally, using the variable in common between these two sets (number of bedrooms) a <br />logarithmic regression was used to estimate SQ FT and number of people. <br />The detailed occupants per household estimated by the regression model were used to <br />develop averages occupancy within four SQ FT Hers, as shown in Table E-11. Based on the <br />regression analysis, the persons per household range from 1.25 for Her 1 (800 SQ FT or less) to <br />3.37 for Her 4 (over 3,000 SQ FT). Table E-11 also shows the average occupancy for all single- <br />family dwellings based on prior US Census data. <br />Table E-11 <br />Single -Family Dwelling Unit Occupancy <br />Avg. People per Dwelling Unit <br />Category <br />Thru 12/31/2021 <br />Beginning 1/1/2022 <br />All Single -Family Dwellings' <br />2.64 <br />-- <br />4-Tier Structurez <br />Tier 1: 800 SQFT or less <br />__ <br />1.25 <br />Tier 2: 801-1500 SQFT <br />__ <br />1.96 <br />Tier 3: 1501-3000 SQFT <br />__ <br />2.71 <br />Tier 4: >3,000 SQFT <br />__ <br />3.37 <br />12007 Parks System Development Charge Study, based on 2000 US Census data. <br />2Based on 2017 ACS Public Use Microdata Area 00400 PUMS for Lane County and tax lot data from <br />the Lane County Assessors Office (2017). <br />1.3.2.2 Multifamily Residential <br />As with single-family residential, U.S. Census data were used to estimate occupancy for <br />multifamily residential dwelling units based on dwelling size, but in the case of multifamily, <br />each tier is based on the number of bedrooms. Table E-12 provides the average people per <br />dwelling unit for each bedroom category. The bedroom data were calculated from the ACS <br />PUMS 2017 Lane County sample. Table E-12 also shows the average occupancy for all duplex <br />and all other multifamily dwellings based on prior US Census data. <br />3 A logarithmic relationship assumes that the rate of change (or number of people) increases initially, but then levels off once the <br />dwelling reaches a certain size. <br />E-13 <br />