Estimating the population size with a behavioral response in capture-recapture experiment

A new estimating procedure is suggested to estimate the population size in a capture-recapture experiment. The capture intensities for first-capture a nd recapture are allowed to be different and time dependent but they are as sumed to be proportional. It is shown that the information on the proportio nality constant is crucial to the estimation of the population size. Sensit ivity analysis with a misspecification of the proportionality constant is c onducted. The method has also been extended to the case with an unknown pro portionality. A real example is given.