"To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of."
The same applies, with perhaps even more force, to analysis of survey based research.
Do you need to design a survey?
CALL ME FIRST!
Designing a survey seems simple. But it's not. There are lots of decisions to make and lots of traps for the uninitiated and unwary. I've designed lots of surveys and analyzed many others. Telling someone to "go back and start over" is not something I like to say and not something anyone wants to hear. But it happens. Sometimes, I can only say what the survey died of.
- How long should the survey be?
- Should it be web-based? Paper-based? Conducted by phone?
- Do you need to give participants assurances of confidentiality and how best to do that?
- What about translation into different languages?
- What response scale should be used?
- Should you offer a reward of some kind for finishing, and if so, what?
Do you know the answers to the above? (hint, many vary depending on the topic, the purpose and the audience).
What's wrong with this question?
Please say how much you agree or disagree with the following statement:
"Barack Obama is to blame for the current economic problems and should be impeached?" (I am not talking about its political content. Something is wrong with how the question wording).
How about this one:
Please state your age _____
Please state how much you agree with this:
I would never not obey the law
You're an expert in what you want to ask and who you want to ask. But you need an expert in how to ask. So, if you need to design a survey, call me first
When you have univariate data, that is, a single measure on a variety of units, the most common statistical...
In a previous post, I dealt with some SAS code for scatterplots. Various problems can arise when using...
On this site I have written quite a lot about regression analysis.
But what is...
When you have bivariate data - that is, data on two variables - either or both may be categorical or...
Whenever you run a SAS program, you should look at the log file. In fact, I have set up keys on my SAS...
Today, we think of probability as an intensively mathematical subject. But the mathematics took a long to...
Statistical consulting for researchers in the social, behavioral and medical sciences.
Many times, researchers will categorize continuous variables. For example, birth weight of human infants is...
In an earlier article, we looked at simple linear regression, which involves one independent variable (IV) and...
This is a paper for NESUG (NorthEast SAS Users' Group) 2010, which you can see as a PDF articleNESUG2010.
I introduced this series the other day. Next up in the list is "getting help". In both SAS and R, there are...
Part of the default output from PROC LOGISTIC is a table that has entries including`percent concordant' and...