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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/9822

Title: Retrospective versus prospective designs for studies of crop-raiding by elephants in Kakum, Ghana
Authors: Barnes, Richard F W
Hema, Emmanuel Midibahaye
Issue Date: Jun-2015
Publisher: Pachyderm
Citation: Pachyderm·June 2015
Abstract: Crop-raiding by elephants continues to increase as human populations in elephant ranges expand. The risk of crop losses can be reduced by identifying the most important farmland features that attract elephants. Risk IDFWRUV YDU\ IURP SODFH WR SODFH DQG PXVW EH LGHQWL¿HG E\ VLWH VSHFL¿F VWXGLHV 7KH PRVW LPSRUWDQW ULVN IDFWRUV include distance of farm to reserve boundary line, area under cultivation, number of crop types on farm and degree of each farm’s isolation. Here we take the data from an earlier prospective study of crop-raiding around WKH .DNXP &RQVHUYDWLRQ $UHD LQ VRXWKHUQ *KDQD WR LOOXVWUDWH D EHWWHU PHWKRG RI DQDO\VLV XVLQJ D ]HUR LQÀDWHG Poisson model. We then use the same data set to illustrate the advantages and drawbacks of a retrospective design. With a retrospective design a raided farm is matched with one or more intact farms at the end of the JURZLQJ VHDVRQ 7KLV PHWKRG LV FRVW HIIHFWLYH IRU ¿HOG ZRUNHUV ZKRVH UHVRXUFHV DUH OLPLWHG EHFDXVH LW GRHV not require repeated visits to farms to monitor raids. The optimum sample size is about 30 raided farms that are each matched with at least two intact farms.
Description: This article was published by Pachyderm·June 2015
URI: http://hdl.handle.net/123456789/9822
Appears in Collections:College of Agric and Natural Resources

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