>> And then, but the response rates for
these types of surveys are not higher than 10%.
Wow, 10%.
>> Yeah.
>> Ooh, that's low.
>> So yes, that's incredibly low.
>> Yeah. >> And obviously,
the ones that participate are probably not a random subset of those-
>> Exactly.
>> Who you invited to participate.
So but with,
with face to face interviewers the response rates are much higher.
But it is incredibly expensive because you
have to pay trained interviewers to do the data collection for you.
So a survey like the Dutch Parliamentary election study,
NKO, in Dutch: Nationaal Kiezers Onderzoek.
Costs somewhere around half a million euros.
>> Whoa.
Okay.
>> And it is conducted over multiple months during each election.
>> Mm-hm.
>> Sometimes multiple waves, I mean often multiple waves,
so that adds to the cost, but it, it costs half a million Euros, or less.
>> So how many respondents take part?
>> A few thousand.
>> A few thousand?
>> Yes. >> That's it?
>> Yep. >> A half a million?
>> Yep. >> Wow.
>> Yep. That's expensive.
>> It's expensive.
But the, so but, the, the, I mean,
the benefit of it is of course, that you get a, you get a very high quality survey.
And much of what we know about Dutch voting behavior, come from the NKO.
So it is, it has a very long tradition.
iI's been collected since 1972.
>> Okay.