A 'Vision Zero' survey that can only be completed by drivers is going to be about as effective as a "mouse protection" survey that can only be completed by cats.
By Kevin Love
Published November 08, 2016
One method of distorting a survey's results is called Sampling Bias. This happens when the survey sample under-represents parts of the population being surveyed.
In its most extreme form, a survey with sample bias will entirely exclude significant parts of the population being surveyed. This can lead to profoundly misleading results.
To quote from the above Wikipedia link, "For example, a study to 'prove' that smoking does not affect fitness might recruit at the local fitness centre, but advertise for smokers during the advanced aerobics class, and for non-smokers during the weight loss sessions."
Another extreme example of sample bias is Hamilton's current "Vision Zero" survey, which can only be completed by drivers.
The problem is with question #5: "How fast do you usually drive?" The response options are:
I presume that everyone else who is not a car driver did the same as me, trying to move on and complete the survey as none of the response options were applicable.
But the survey cannot be submitted without that question being answered, and none of the options can be chosen by someone who is not a driver.
Please see the screenshot below. People who are pedestrians, cyclists or public transit users cannot complete this survey because the form validation will not accept it.
'This question requires an answer'
A "Vision Zero" survey that can only be completed by drivers is going to be about as effective as a "mouse protection" survey that can only be completed by cats.
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