[R] [R Survey Analysis] Problem counting number of responses

Jim Lemon drjimlemon at gmail.com
Wed Aug 17 02:03:58 CEST 2016

```Hi Lauren,
As Sarah noted, if your blank responses are coming as NAs, it may be
best to leave them alone until you have done the calculations:

survey\$responses<-!is.na(survey[,c("q1","q2","q3")])
survey\$sum_survey<-rowSums(survey[,c("q1","q2","q3")],na.rm=TRUE)
# the next line returns a logical vector that you can use to subset
# like this survey[q_complete,]
q_complete<-complete.cases(survey[,c("q1","q2","q3")])

then set your NAs to zeros if you need to.

Jim

On Wed, Aug 17, 2016 at 4:51 AM, Lauren Bolger <lebolger at gmail.com> wrote:
> M
> y dataset includes a survey completed by research participants to evaluate
> quality of life. A few things regarding the survey:
>
>
>    -
> *not all questions must be answered for the total score *
>    - questions left blank are coded as "0"
>    - the number of questions answered must be determined in order to
>    compute the total score
>
>
> *Sample Code*
>
>> q1 <- ifelse(is.na(survey, 0, survey\$q1)
>
>> q2 <- ifelse(is.na(survey, 0, survey\$q2)
>
>> q3 <- ifelse(is.na(survey, 0, survey\$q3)
>
>> survey\$sum.survey <- q1 + q2 + q3
>
>> survey\$responses <- # HELP ?????
> *> # HELP PART 1 ------------------------------*
> *> # need help determining number of questions the respondents answered*
>
>> *# HELP PART 2 -------------------------------*
> *> # I want to look at the subset of the population that completed all the
> questions*
>
>
>
>
> Thanks for your help!! It means a lot :)
>
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>
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