Svend Kreiner
speaker
11 appearances
1 recordings
1 series
first heard Apr 2011
last heard Apr 2011
Svend Kreiner’s voice in public audio — every appearance, attributed to the second.
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Appearances
I don't think it's reliable at all.
I'm sorry, that's a sorry fact.
There's in particular one problem that is really serious for what they're using PISA data for.
Something called differential item functioning or item bias.
And this is a problem we have when items in educational tests have different degrees of difficulty in different countries.
And in this case, I'm not actually able to find two items in PISA's test that functions in exactly the same way in different countries.
It looks as if the ranking of countries depend very much upon the composition of their tests in terms of items that are difficult in some countries and items that are easy in some countries.
It's an extremely big difference for UK.
I can get them up at number 8 or down as number 36.
Oh, but I have the data.
I'm doing this using their own data.
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