20ModelLME(1)

20ModelLME(1) - IDENTIFYINGANAPPROPRIATEMODEL

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Unformatted text preview: IDENTIFYINGANAPPROPRIATEMODEL Givenadescriptionofastudy,howdoyouconstructan appropriatemodel? Context:morethanonesizeofe.u. Amade-upexample,intendedtobecomplicated (butfarfrombeingthemostcomplicatedI’veseen) Astudyoftheimpactofmicro-creditschemesinGhana(West Africa).Micro-creditistheideathatbyprovidingsmallloans,you canstimulateeconomicactivityandbringpeopleoutofpoverty andmalnutrition.Therearevariouswaysthiscanbe implemented,asgivingloans,asgivingloansandnutrition education,orbyjustgivingnutritioneducation.Ghanahasamix ofurban,suburban,andruralareas.Rainfalldecreasesfromthe coast(tropicalrainforest)tosemi-desertonthenorthernborder withBurkina-Faso.Bothareimportantblockingvariables,soa LatinSquaredesignwasused. c 2011Dept.Statistics(IowaStateUniversity) Stat511section20 1/15 Ghanawasdividedintofourrainfallzones;ineachzoneanurban, anear-suburban,afar-suburban,andaruralareawereidentified. Thethreetreatmentsandaplacebowererandomlyassignedto areassubjecttoLatinSquareconstraints: Rainfallzone Area Wet Wet-mid Mid Dry Urban Loan None L+N Nutr. NearSuburban None L+N Nutr. Loan FarSuburban L+N Nutr. Loan None RuralNutr. Loan None L+N These16areasarestillquitelarge.Eachareawasdividedinto3. Withineach1/3’rd,onevillageorneighborhoodwasrandomly chosenasthefocalgroup.Thatgroupreceivedtheexperimental treatment. Anadjacentvillage/neighborhoodwithinthe1/3’rdreceivedno treatment(control). Asomewhatdistantvillage/neighborhood(stillwithinthe1/3’rd)was alsostudied. c 2011Dept.Statistics(IowaStateUniversity) Stat511section20 2/15 Theresponseofinterestisameasureoffoodsecurity good:haveenoughfood bad:atelessthanonemealperday. continuousscalederivedfrom15answerstoaquestionaire Thisismeasuredonrandomlychosenfamilieswithineach village/neighborhood. Questionsconcern: Differencesbetweentypesofassistance(none,L,N,L+N) Differencesbetweenfocal,controlanddistantcontrolvillages.Differencesbetweenfocal,controlanddistantcontrolvillages....
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This note was uploaded on 02/11/2012 for the course STAT 511 taught by Professor Staff during the Spring '08 term at Iowa State.

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20ModelLME(1) - IDENTIFYINGANAPPROPRIATEMODEL

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