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<br />Concepts and Definitions <br />Capture-recapture Estimation Models <br /> <br />Robust: <br />- Assumes geographic closure <br />. Uses <::Iosed models to analyze data from mulllple <br />sampling occasions within it year <br />. Uses Open models to estimate additional parameters <br />. OptimIzes USe 01 all the data within and atnong years <br />. Has Ilaxiblllly to BCCQmmodate 50Utcas 01 varIation In <br />sampling and demographics <br /> <br />Concepts and Definitions <br />Statistical concepts <br /> <br />Bias: <br />- Does the estimator produce the 'right answer' on <br />the average? If so, it is unbiased. <br />Precision: <br />- How reliable or variable is the estimator? <br />Both properties of capture-recapture <br />estimators are affected by the number of <br />captures and capture probability <br /> <br />Concepts and Definitions <br />Statistical concepts <br /> <br />Model selection: <br />- Let the data objectively determine what model <br />assumptions are reasonable <br />.~ Compare alternative mOdels to determIne the <br />most parsimonious synthesis of the data <br /> <br />CV'IUrll!.rll!CN\U",INlOltllGIl..l_ <br />Uppool_ <br /> <br />,~ <br /> <br />~, <br /> <br />~, <br /> <br />~, <br /> <br />11\, <br /> <br />''''l'l'''f <br />........,,"'" <br /> <br />"""dC",\'<n <br /> <br />,~ <br /> <br />/(~"CCIlCCC'C_=~==~_ If <br /> <br />''''!'Ii.. <br />"""'.." <br /> <br />-. <br /> <br />::-;-:;~-.::~-::..:=:::-:~~_-:-~~::=-~~.:-":~:-~ ~ ._--~::::-::-.:-=:;::"_::~_::~ <br /> <br />"" <br /> <br />11\, <br /> <br />11\, <br /> <br />11\, <br /> <br />11\, <br /> <br />,"'pli", <br />""""" <br /> <br />/iTA TISTIO:;AI, PRorlCRTIES UP ERTIMI\..I'OR~ <br /> <br />~ .~: <br /> <br />Unbiased and Unbiased but not <br /> <br />:::~ P"'~', <br />Biased but Biased and not <br />precise precise <br /> <br />DATA. MQDElS. ANI> PARAMETER El;nMAIION <br /> <br />! <br />I <br />I <br />, <br />I <br /> <br /> <br />-- II!<DPA:. -J <br /> <br />2 <br />