[Oz-gifted] tests in the public system

[sol1]

This is true Keith, we don't.

Reliability coeffeicients on the new tests are only marginally less for 
younger children than for older, however when you speak of the reliability 
of a psychological test, that is generally what is meant. Its predictive 
value is its validity

cheers
Fin

----- Original Message ----- 
From: "Keith McGuinness" <keith.mcguinness at bigpond.com>
To: <oz-gifted at cobia.ed.qut.edu.au>
Sent: Wednesday, September 20, 2006 5:02 PM
Subject: Re: [Oz-gifted] tests in the public system


> sol1 wrote:
>> Reliability in psychological tests refers to consistency or stability in
>> measurement, not prediction of adult IQ or anything to do with ceilings.
>
> Yes but we don't know what sense the term "reliability" was being
> used in, in this particular case. It may well NOT be the sense
> you are referring to. (EG precision and accuracy are used
> interchangeably in casual conversation but, in statistics, they
> mean two quite different things.)
>
> Studies show that measurements of IQ at, say, age 8 are usually
> better correlated with adult IQ than measurements at, say, age 5.
> (If I am remembering correctly; I don't have my psych tests book
> with me.)
>
> This is the main reason, as far as I know, why results on older
> children are regarded as more "reliable" indicators of potential.
>
> Keith McGuinness
>
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