An R and S-Plus Companion to Applied Regression by John Fox PDF

By John Fox

ISBN-10: 0761922792

ISBN-13: 9780761922797

"This e-book suits into a wanted area of interest: rigorous sufficient to offer complete rationalization of the facility of the S language, but obtainable adequate to assign to social technology graduate scholars with no worry of intimidation. it's a super stability of utilized statistical "firepower" and considerate clarification. It meets the entire vital mechanical wishes: every one instance is given intimately, code and knowledge are freely to be had, and the nuances of types are given instead of simply the naked necessities. It additionally meets a few vital theoretical wishes: linear versions, express info research, an creation to making use of GLMs, a dialogue of version diagnostics, and important directions on writing custom-made capabilities. "

-Jeff Gill, college of Florida, Gainesville

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Additional resources for An R and S-Plus Companion to Applied Regression

Sample text

1 present s a typica l regressio n mode l in whic h th e X's ar e th e predicto r variables , Y is th e criterio n variable , th e b's ar e regressio n coefficients , th e residua l e is th e unexplaine d variance , an d th e curved , double-heade d arrow s connectin g th e predicto r variable s represen t thei r intercorrelations . Not e tha t ther e ar e 10 intercorrela tion s tha t ar e give n muc h less attentio n in regressio n tha n the y deserv e (for som e statisti c packages , eve n seein g the m require s askin g for optiona l output) .

Th e shortcoming s of regressio n approache s therefor e ar e importan t to conside r an d ar e covere d in Chapte r 4 of thi s book . I Movin g Beyon d Pat h Analysi s in Structura l Equatio n Modelin g Researc h Afte r a surg e of interes t in th e leas t square s methods , th e limitations , especiall y of pat h analysi s technique s describe d in detai l in Chapte r 3, led th e method s int o disfavor . It wa s eas y to criticiz e th e approaches . For example , mos t theoretica l variable s ar e assesse d inaccuratel y du e to bot h imprecisio n in operationalizin g the m an d inaccurac y in mea surin g th e observe d measures .

Becaus e correlation s d o no t allo w for changes/difference s in variances , onl y if variance s ar e equa l acros s samples/groups/time s is it appropriat e to compar e cor relations. ) Althoug h th e differenc e betwee n correlation s an d covariance s ofte n is a difficul t on e for reader s to understand , on e wa y in whic h to view it is to thin k abou t it in its extreme , namely , in situation s wher e restrictio n of rang e in a variabl e attenuate s its correlatio n wit h othe r variables .

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An R and S-Plus Companion to Applied Regression by John Fox

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