3.3 Entire-Yard Vegetation There are significantly more cultivated garden species in back yards than front yards, but there are no differences for spontaneous species (Table 4-3). Hypothesis 4 was supported but Hypothesis 5 was not. The back-transformed (i.e. exponentiated) intercept was 15.92, while the back/front coefficient was 1.52. Backyards have a estimate of approximately 10% more species. There was no statistically significant interaction effect for city. The raw, unconditional mean richness for cultivated species was 19.53 (median = 17) in front yards, and 24.71 (median 21) in back yards. Back yards on average contained ~20% more species than front yards. Table 4-3 Mixed model output for entire-yard vegetation species by front and back yard by region. Cultivated Garden Spontaneous Garden Species Richness Species B CI p B CI p Fixed Parts (Intercept) 2.77 2.44 to 3.09 2.35 2.00 to 2.69 <.001 <.001 Front / Back (Back as 0.42 to 0.76 .015 0.24 .212 to Reference) Salt Lake City (Los Angeles as 0.02 .912 .137 to 0.45 0.34 to 0.11 Reference) Front / Back x .055 0.14 .570 Salt Lake City to to 0.63 Random 0.309 0.384 σ2 τ00, 0.131 0.128 City:Lot_ID Lot_ID 0.133 0.150 τ00, 51 51 NLot_ID 51 51
0.34 3.3 Entire-Yard Vegetation There are significantly more cultivated garden species in back yards than front yards, but there are no differences for spontaneous species (Table 4-3). Hypothesis 4 was supported but Hypothesis 5 was not. The back-transformed (i.e. exponentiated) intercept was 15.92, while the back/front coefficient was 1.52. Backyards have a estimate of approximately 10% more species. There was no statistically significant interaction effect for city. The raw, unconditional mean richness for cultivated species was 19.53 (median = 17) in front yards, and 24.71 (median 21) in back yards. Back yards on average contained ~20% more species than front yards. Table 4-3 Mixed model output for entire-yard vegetation species by front and back yard by region. Cultivated Garden Species Richness Spontaneous Garden Species B CI p B CI p Fixed Parts (Intercept) 2.77 2.44 to 3.09 <.001 2.35 2.00 to 2.69 <.001 Front / Back (Back as Reference) 0.42 to 0.76 .015 0.24 to .212 Salt Lake City (Los Angeles as Reference) 0.02 to 0.45 .912 to 0.11 .137 Front / Back x Salt Lake City to .055 0.14 to 0.63 .570 Random σ2 0.309 0.384 τ00, City:Lot_ID 0.131 0.128 τ00, Lot_ID 0.133 0.150 51 51 NLot_ID 51 51