In Condor 109(4), November 2007, equations in the paper “Approximating variance of demographic parameters using the delta method: a reference for avian biologists” by Larkin Powell contained errors by the author.

Table 1 contained an error in the example given for the variance of the function θ1/7. The corrected formula for the variance is


Table 3, as corrected, is:


Approximations for sampling variance of survival estimates, by the delta method, when changing the scale of temporal units.

©2012 by The Cooper Ornithological Society. All rights reserved. Please direct all requests for permission to photocopy or reproduce article content through the University of California Press's Rights and Permissions website,
"Erratum," The Condor 114(3), 678, (1 August 2012).
Published: 1 August 2012
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