I just came across a recent blog post by Deborah Ruf, where she discusses how she is finding the Flynn effect to be much higher in GT kids. She says that the average life span of an IQ test is 12-13 years, and if you take a test on the last legs of its life, your score may be overestimated. On the flip side, if you take a test when it's brand new, your score may be underestimated. Her point below about how we are making educational decisions based on these scores is what caught my eye. Personally, I don't think anyone should make big decisions based on just one test, but some schools will include/exclude based on a particular number.
"The matrix pattern reasoning and one or two other subtests account for most of this inflation over the years, but the real point is that we are over-estimating the level of giftedness of kids who take the tests when the tests are older and under-estimating the level of giftedness of the kids who take the test when the test is fairly new. More kids test as being Profoundly Gifted who may not actually be if they take the tests when the tests are older."
The Flynn Effect Affects the Gifted...
