[HOT] Fwd: [OpenStreetMap] Student Survey Humanitarian OpenStreetMap Team Goethe-University Frankfurt

Katja Ulbert mail at katja-ulbert.de
Thu Jun 11 18:35:43 UTC 2015

Hi John,

it wasn´t my intention to falsify their results;-) But the request 
didn´t come from HOT itself, so I wanted to check if anybody knew about 
it. I have never given my email or contact data to this university. They 
are registered as a HOT user and send me a message.



Am 11/06/15 um 19:42 schrieb john whelan:
> If you've been selected for a random sample, and it is a true random 
> sample, passing the link to anyone else effectively contaminates the 
> sample.
> Random sampling is a mathematical technique that is used in surveys to 
> draw conclusions based on a small sample that can be extrapolated to a 
> larger population.
> By passing the link on the responses will be bias towards more 
> experienced mappers who read the list, so to preserve the methodology 
> the survey should only be completed by the person it was sent to.
> There was a discussion earlier in the list with a comment from Pierre 
> saying it would be useful to run slightly different surveys with 
> questions aimed at new mappers, mappers with some experience and  very 
> experienced mappers.  I don't know if this survey is of that type.
> Cheerio John

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