| change | Compute the change in the population over a time interval. | 
| checkFit | Check goodness of fit of a trend model. | 
| goldcrest | Data for goldcrest from the Swedish Bird Survey. | 
| greenfinch | Data for greenfinch from the Swedish Bird Survey. | 
| hessBootstrap | Compute bootstrap confidence intervals based on sampling from... | 
| plot.trend | Plot an estimated trend. | 
| poptrend | Analyze population trends from survey count data. | 
| print.trend | Print a trend object. | 
| ptrend | Fit a smooth or linear trend to count survey data. | 
| simTrend | Simulate population survey data. | 
| summary.trend | Summary of trend estimates | 
| trend | Define a trend component. | 
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