The following download uses a set of simplified sight-resight history frequencies for a sample of dogs in a city block to estimate what fraction of the dogs that roam in that block are seen on any one count. A sample of distinctive dogs is identified during the first count and resights of those dogs on a second and third count recorded. For each identified dog the four possible histories are thus: seen on both the second and third counts; seen on neither the second nor the third count; seen on the third but not the second count; seen on the second but not the third count. The four frequencies are entered on a screen and an estimate of the fraction of dogs seen on any one count returned along with an estimate of the fraction of dogs that are permanently visible.

SightResight_hetero_install.zip

LIST OF ADDITIONAL PROGRAMS

• Sterilisation rates required to stabilise a population
• A regression estimator for a roaming dog population
• An estimator for total roaming dogs in a city block using sight-resight data (allowing for possible emigration)
• An estimator for total roaming dogs in a city block using sight-resight data (allowing for possible heterogeneity)
• A program for using temporary marking of owned dogs to estimate numbers of owned and unowned dogs
• A program for using permanent marking of roaming dogs to estimate their survival
• Population dynamics

AN ESTIMATOR FOR TOTAL ROAMING DOGS IN A CITY BLOCK USING SIGHT-RESIGHT DATA (HETEROGENEITY]