Common Contracts
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Distribution AgreementDistribution Agreement • April 15th, 2015
Independence among sources is a major assumption when using two-source CR. Lack of independence could lead to bias in the estimates. In order to check the dependence between sources, the probability of being captured in the Source 1 is compared to the probability of being recaptured in the Source 2. The probability of being captured in Source 1 is estimated as the number of captures in the Source 1 divided by the number of estimated total captures using the CR equation (Eq. 5). The probability of being recaptured is estimated using the number of captures found in both sources divided by the number of captures found in the Source 2 (Eq. 6). When the two sources are independent, the recapture rate is approximately equal to the capture rate in the population (N1/N = X12/N2).17 When the two populations are positively dependent, the recapture rate is expected to be larger than the capture rate, thus underestimating the estimated total (X12/N2 (recapture) > N1/N (capture)), and when the two
