[R] Resetting Baseline Level of Predictor in svyglm Function

[Anthony Damico]

hi, i think you want

elsq1ch_brr <- update( elsq1ch_brr , F1HIMATH = relevel(F1HIMATH,"PreAlg or
Less") )





On Mon, Oct 31, 2016 at 9:05 PM, Courtney Benjamin <cbenjami at btboces.org>
wrote:

> Hello R Users:
>
> I am using the survey package in R for modeling with complex survey data.
> I am trying to reset the baseline level of certain predictor variables
> being used in a logistic regression without success. The following is a
> reproducible example:
>
> library(RCurl)
> library(survey)
>
> data <- getURL("https://raw.githubusercontent.com/
> cbenjamin1821/careertech-ed/master/elsq1adj.csv")
> elsq1ch <- read.csv(text = data)
>
> #Specifying the svyrepdesign object which applies the BRR weights
> elsq1ch_brr<-svrepdesign(variables = elsq1ch[,1:16], repweights =
> elsq1ch[,18:217], weights = elsq1ch[,17], combined.weights = TRUE, type =
> "BRR")
> elsq1ch_brr
>
> #Log. Reg. model
> allCC <- svyglm(formula=F3ATTAINB~F1PARED+BYINCOME+F1RACE+F1SEX+
> F1RGPP2+F1HIMATH+F1RTRCC,family="binomial",design=
> elsq1ch_brr,subset=BYSCTRL==1&G10COHRT==1,na.action=na.omit)
> summary(allCC)
>
> ##Attempting to reset baseline level for predictor variable
> #Both attempts did not work
> elsq1ch$F1HIMATH <- C(elsq1ch$F1HIMATH,contr.treatment, base=1)
> elsq1ch$F1HIMATH <- relevel(elsq1ch$F1HIMATH,"PreAlg or Less")
>
> #Log. Reg. model with no changes in baseline levels for the predictors
> allCC <- svyglm(formula=F3ATTAINB~F1PARED+BYINCOME+F1RACE+F1SEX+
> F1RGPP2+F1HIMATH+F1RTRCC,family="binomial",design=
> elsq1ch_brr,subset=BYSCTRL==1&G10COHRT==1,na.action=na.omit)
> summary(allCC)
>
>
> Any guidance is greatly appreciated.?
>
> Sincerely,
>
> Courtney?
>
> Courtney Benjamin
>
> Broome-Tioga BOCES
>
> Automotive Technology II Teacher
>
> Located at Gault Toyota
>
> Doctoral Candidate-Educational Theory & Practice
>
> State University of New York at Binghamton
>
> cbenjami at btboces.org<mailto:cbenjami at btboces.org>
>
> 607-763-8633
>
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>
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