[Oz-gifted] tests in the public system

[sol1]

lol - just before you respond let me clarify - a tests validity is it's 
ability to test what it claims to test,  for example achievement test with 
high validity could predict a childs academic achievment level

cheers
Fin

----- Original Message ----- 
From: "sol1" <talthean at optusnet.com.au>
To: <keith.mcguinness at bigpond.com>; <oz-gifted at cobia.ed.qut.edu.au>
Sent: Wednesday, September 20, 2006 5:37 PM
Subject: Re: [Oz-gifted] tests in the public system


> 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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