search for: occu1

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2012 Aug 14
1
Error; contrasts can be applied only to factors with 2 or more levels
...vations: 0 1 <NA> 223 19 0 Site-level covariates: x1 x2 2: 8 2: 8 3:92 3:92 4:21 4:21 Observation-level covariates: x3 Min. : 10.00 1st Qu.: 35.00 Median : 67.00 Mean : 65.92 3rd Qu.: 86.00 Max. :174.00 > > (occu1 <- occu(~1 ~ 1, umf)) Call: occu(formula = ~1 ~ 1, data = umf) Occupancy: Estimate SE z P(>|z|) -1.95 0.325 -6.01 1.82e-09 Detection: Estimate SE z P(>|z|) 0.539 0.556 0.969 0.333 AIC: 114.2012 > (occu2 <- occu(~x3 ~x1, umf)) Call: occu(formula = ~x...