Returns a list of all the unique questions in the surveydata object.

Description

In many survey systems, subquestions take the form Q1_a, Q1_b, with the main question and subquestion separated by an underscore. This function conveniently returns all of the main questions in a surveydata object. It does this by using the pattern attribute of the surveydata object.

Usage

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  questions(x, ptn = pattern(x))

Arguments

x

Object to coerce to surveydata

ptn

A list with two elements, sep and exclude. See pattern and which.q for more detail. By default

Value

numeric vector

See Also

which.q

Other Question functions: qText, qTextCommon, qTextUnique, splitCommonUnique, which.q

Examples

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# Basic operations on a surveydata object, illustrated with the example dataset membersurvey

class(membersurvey)

questions(membersurvey)

which.q(membersurvey, "Q1")
which.q(membersurvey, "Q3")
which.q(membersurvey, c("Q1", "Q3"))

qText(membersurvey, "Q3")
qTextUnique(membersurvey, "Q3")
qTextCommon(membersurvey, "Q3")

# Extracting columns from a surveydata object

head(membersurvey[, "Q1"])
head(membersurvey["Q1"])
head(membersurvey[, "Q3"])
head(membersurvey[, c("Q1", "Q3")])

# Note that the result is always a surveydata object, even if only one column is extracted

head(membersurvey[, "id"])
str(membersurvey[, "id"])

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