survey methodology survey instruments (2) epid 626 lecture 8
TRANSCRIPT
Survey MethodologySurvey Instruments (2)
EPID 626
Lecture 8
Reference
• Most elements for this lecture were taken from :
Mangione, Thomas. Mail Surveys: Improving the Quality. Applied Social Research Methods Series, Vol 40. Sage Publications, 1995.
– Chapter 2, The Basics of Question Design
Open-ended questions• Short, specific
– What is your current age?
• Long, narrative– Why did you choose to come to this clinic?
• Problems:– Illegible handwriting– Inappropriate detail
• Usually avoid-the rest of the lecture is devoted to closed-ended questions
Yes/No and checklist questions
• Yes/No
• Checklist– From a list of alternatives, check those that
apply– Problematic because you can’t distinguish
a “No” from a skip– Yes/No may be better because it forces
thought
Multiple-choice questions• Response alternatives should be
mutually exclusive and exhaustive• Think about whether you want
respondents to just check one response or to be able to check multiple responses– Multiple responses may complicate analysis– Think about presenting alternatives as a
checklist
Multiple-choice questions (2)
• Include “Other” as an alternative?– What does it tell you?
• About the respondent?• About your question?
– Use open-ended “Specify”________– May be useful during pretesting or if you
are planning on revising the survey instrument
Semantic differential questions
• Two opposite adjectives at the ends
Best Worst
1 2 3 4 5 6 7
• Sometimes ask the question for two scenarios, ex: current situation and ideal situation, and look at the differential
Ranking questions
• Present alternatives and ask respondents to rank them– Ex: rank from the most important to the
least important
• Think about whether you want to allow tie rankings– How will that affect your analysis?
Two common formats
1
__ Eating fruit
__ Exercising
__ Meditating
__ Being happy
__ Sleeping enough
2
Eating fruit 1 2 3 4 5
Exercising 1 2 3 4 5
Meditating 1 2 3 4 5
Being happy 1 2 3 4 5
Sleep enough 1 2 3 4 5
Number 2 is usually preferable. Why?
Rating Scales• Present a respondent with a question or
statement and a range of responses
• Ex. How would you rate your relationship with your physician?
Excellent Very good Good Fair Poor
Rating scales (2)
• Likert scale:
Ex. Patients should have the right to sue Health Maintenance Organizations
Strongly Agree Unsure Disagree Strongly agree disagree
Rating scales (3)
• Psychological distance– Distance between alternatives should be
equal
• Number of response alternatives– Usually 3 to 7 are recommended– What might affect your choice?– Think about your research question– Think about the complexity of the issue
Rating scales (4)
• Order of response alternatives– Should be monotonically increasing or
decreasing– Should all be ordered in a column or row– Within a survey, may want to mix up
increasing and decreasing by section, but never within a section
Rating scales (5)
• Unipolar response alternatives– Range from “nothing” to “a great deal”
Excellent Very good Good Fair Poor
• Bipolar response alternatives– Range from “large negative” through “zero”
to “large positive”Strongly Disagree Unsure Agree Strongly
disagree agree
Rating scales (6)
• Odd or even number of alternatives?– Odd numbers create a midpoint
• This midpoint should be a neutral response• Many respondents really like midpoints and will
use them a lot!!!
– Even numbers force people to make a decision
– Depends on your research question
Rating scales (7)
– For very complex, emotional issues, you may want to have 2 middle points
• Ex. Slightly agree and Slightly disagree
• Balanced scales– Should have equal numbers on either side
of neutral – Unbalanced scales will lead to bias
Rating scales (8)
• “Don’t know” as an alternative– Usually necessary for knowledge questions– For attitude questions, “don’t know” usually
means “unsure”. Adding more middle categories may be a better solution
– Sometimes use a screen question then initiate a skip sequence
Rating scales (9)
• Example of a screening question:1. Are you familiar with the proposed legislation
regarding universal healthcare?
(circle one)
Yes Go to question 2.
No Go to question 17.
Rating scales (10)
• Behaviorally anchored scales– Objective, quantitative– Compare to subjective scales
Ex: How often do you exercise in a week?
• Subjective: Often Sometimes Never
• Behaviorally anchored: 5 times 3-4 times 1-2 times Never
• Which one to use?– Depends on your research question
General Recommendations• Write brief questions• Write clear questions
– Define ambiguous terms– Avoid jargon– Avoid double negatives– Avoid unclear pronouns– For open-ended questions, avoid adverbial
constructions such as how, why, when, where
General Recommendations (2)
• Be careful with:– Intentions– Hypotheticals– Assumptions: commonplace is not
universal
• Write unidimensional questions
• Write mutually exclusive and exhaustive response alternatives
General Recommendations (3)
• Generally avoid loaded questions– Special case for questions that may involve
social desirability– When might we want to ask loaded
questions?
• “Most people have times when they drink too
much and feel tipsy. How often has this happened to you in the last month?”
• “Most people feel that smoking marijuana is harmful. How do you feel?”
• “Marijuana has been shown to be an effective treatment for people with some symptoms of AIDS. How do you feel about legalizing marijuana?”