Abbreviated Journal Title
adjusted means; Alligator mississippiensis; analysis of covariance; weighted least squares estimators; Ecology
In some situations, survey counts must be adjusted for the effects of concomitant variables using analysis of covariance in order to detect a trend in abundance over time. A power analysis in these cases allows the calculation of the probability of detecting a trend after adjustments. The methods will be applicable to samples taken at regular or irregular intervals in time or space, and in which the effects of the concomitant variables do not change over time. Furthermore, the detection of linear and intrinsically linear change can be determined. The methods are applied to the monitoring of American alligator (Alligator mississippiensis) populations in Florida.
Nickerson, David M. and Brunell, Arnold, "Power analysis for detecting trends in the presence of concomitant variables" (1998). Faculty Bibliography 1990s. 2387.