1. We describe an open source R package agTrend for analyzing regional trends of abundance from sites with uneven sample schedules. 2. The package agTrend uses an abundance summary approach to estimate trends. By considering abundance trends in this fashion, rather than a model parameter, we can easily augment missing observations to calculate aggregated abundance and trends. 3. The package use...

Two models of binary fragmentation are introduced in which a time dependent transition size produces two regions of fragment sizes above and below the transition size. In the models we consider a fixed rate of fragmentation for the largest fragment and two different rates of fragmentation for the two regions of sizes above and below the transition size. The models are solved exactly in the long...