R help - Nov 2016 - Further Subsetting of Data for Log. Reg. Results in qr.default Error

Hello R Experts,

In further subsetting data within a logistic regression in the survey package, I
am getting a qr.default error.

Below is an example of the original model that runs correctly, but when I subset
the data further to look at students of a particular curriculum concentration,
the qr.default error occurs.  I thought it may have been related to converting
the F1RTRCC variable into a factor for use in the original model; I went back
and restored that variable to its original form and it didn't help.

Any guidance is greatly appreciated.


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

##Resetting baseline levels for predictors
elsq1ch_brr <- update( elsq1ch_brr , F1HIMATH = relevel(F1HIMATH,"PreAlg
or Less") )
elsq1ch_brr <- update( elsq1ch_brr , BYINCOME =
relevel(BYINCOME,"0-25K") )
elsq1ch_brr <- update( elsq1ch_brr , F1RACE =
relevel(F1RACE,"White") )
elsq1ch_brr <- update( elsq1ch_brr , F1SEX = relevel(F1SEX,"Male")
)
elsq1ch_brr <- update( elsq1ch_brr , F1RTRCC =
relevel(F1RTRCC,"Academic") )

#Log. Reg. model-all curric. concentrations including F1RTRCC as a predictor
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)

##CTE Log. Reg. model that is resulting in the qr.default error
CTE <-
svyglm(formula=F3ATTAINB~F1PARED+BYINCOME+F1RACE+F1SEX+F1RGPP2+F1HIMATH,family="binomial",design=elsq1ch_brr,subset=BYSCTRL==1&G10COHRT==1&F1RTRCC=="Academic",na.action=na.omit)
summary(CTE)



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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