Trend of the Yellowstone Grizzly Bear Population

Table 1

Estimates of rate of change (𝑟), bias (3), and 95% confidence intervals for various methods of estimation using the exponential model.

			95% Confidence
METHOD	Estimate of 𝑟	Bias equation (4)	Interval on 𝑟
			Lower	Upper
Regression (log transformed counts)	0.0526	—	0.0422	0.07
Bootstrap (log transformed counts)	0.0563	2.00E-04	0.041	0.071
Basic bootstrap c.i.			0.04	0.071
Percentile method c.i.			0.042	0.072
BCA method c.i.			0.041	0.072
Nonlinear Least-squares exponential model	0.0526	—	0.039	0.066
Bootstrap of Nonlinear L.S. Model	0.0526	0.0007	0.037	0.066
Basic bootstrap c.i.			0.036	0.066
Percentile method c.i.			0.039	0.069
BCA method c.i.			0.036	0.066
Generalized linear model (Poisson errors)	0.054	—	0.043	0.065