Gifted Bulletin Board

Welcome to the Gifted Issues Discussion Forum.

We invite you to share your experiences and to post information about advocacy, research and other gifted education issues on this free public discussion forum.
CLICK HERE to Log In. Click here for the Board Rules.

Links


Learn about the Davidson Academy’s online campus for profoundly gifted students living anywhere in the U.S.

The Davidson Institute is a national nonprofit dedicated to supporting profoundly gifted students through the following programs:

  • Fellows Scholarship
  • Young Scholars
  • Davidson Academy
  • THINK Summer Institute
  • DITD FaceBook   DITD Twitter   DITD YouTube
    The Davidson Institute is on Facebook, Twitter and YouTube!

    How gifted-friendly is
    your state?

    Subscribe to the Davidson Institute's eNews-Update

    Who's Online
    0 registered (), 0 Guests and 48 Spiders online.
    Key: Admin, Global Mod, Mod
    Newest Members
    hannahjeni, Catherine86, Chaj, AlanLuiz, Jach
    11221 Registered Users
    October
    Su M Tu W Th F Sa
    1
    2 3 4 5 6 7 8
    9 10 11 12 13 14 15
    16 17 18 19 20 21 22
    23 24 25 26 27 28 29
    30 31
    Page 1 of 2 1 2 >
    Topic Options
    #213285 - 03/25/15 03:22 PM How to calculate GAI?
    George C Offline
    Member

    Registered: 03/12/15
    Posts: 282
    My son recently took the WISC-IV and he tested with the following scores: <deleted>

    The psychologist who did the testing did not calculate a GAI for whatever reason (though she did indicate that the FSIQ was likely underreporting his capabilities).

    So I was curious and looked up how to calculate GAI. It appears that there are two methods of doing this: one uses the sum of the VCI and PRI, and the other uses the sum of the six subtests of those indices (his six subtest sum was 101). The subtest sum method seemed to state that it was a superior measure over methods that don't use subtest scores.

    Is one method generally more accepted than the other? One method gives him a GAI of <lower score> and the other <higher score>.




    Edited by George C (09/12/16 06:40 AM)
    Edit Reason: removed scores to hamper data gathering

    Top
    #213304 - 03/26/15 08:01 AM Re: How to calculate GAI? [Re: George C]
    Loy58 Offline
    Member

    Registered: 09/11/13
    Posts: 816
    George, great scores! That WMI coupled with such high reasoning scores is a great combination! I'd also be asking the tester (or perhaps you can see from results) whether your DS eligible for extended norms (2 or more subtests at 19, and he may have scored additional points beyond, esp. in VCI)? Can you ask your tester to calculate the GAI? If not, perhaps aeh is near... wink

    Top
    #213307 - 03/26/15 08:13 AM Re: How to calculate GAI? [Re: George C]
    cmguy Offline
    Member

    Registered: 03/30/14
    Posts: 387
    We had our tester do a GAI and it was higher than the FSIQ. Since the PSI is the lowest score the GAI will likely be higher?

    The tester should be able to do a revised report with the GAI if you ask.

    Top
    #213310 - 03/26/15 08:21 AM Re: How to calculate GAI? [Re: George C]
    KADmom Offline
    Member

    Registered: 03/11/13
    Posts: 690
    Those are great scores indeed! As that working memory is beautiful!

    Top
    #213311 - 03/26/15 08:23 AM Re: How to calculate GAI? [Re: George C]
    Pi22 Offline
    Junior Member

    Registered: 12/30/12
    Posts: 45
    The most widely used method is the sum of the six subtests as described in the WISC-IV Technical Report #4:

    http://images.pearsonclinical.com/images/assets/WISC-IV/80720_WISCIV_Hr_r4.pdf

    which is the 151 you report for a sum of scaled scores of 101.

    Top
    #213325 - 03/26/15 12:16 PM Re: How to calculate GAI? [Re: George C]
    aeh Offline
    Member

    Registered: 04/26/14
    Posts: 3984
    Yes, the TR posted by Pi22 is the recommended method of calculating the GAI. The other method was a statistical approximation developed by third parties before Pearson released the official method, which was derived from the actual standardization sample.

    The FSIQ
    Excellent scores one way or the other. Did he have any 19s among the subtest scores? If there were at least two, that would be reason to look into extended IQ scores.
    _________________________
    ...pronounced like the long vowel and first letter of the alphabet...

    Top
    #213334 - 03/26/15 11:17 PM Re: How to calculate GAI? [Re: George C]
    George C Offline
    Member

    Registered: 03/12/15
    Posts: 282
    Thanks, everyone, for the advice and the encouragement! We're still a bit shocked he tested so high, as he seems reasonably normal to us. smile

    Aeh, his only 19 was on the vocabulary subtest. The others were all 16s and 17s.

    Top
    #213345 - 03/27/15 08:11 AM Re: How to calculate GAI? [Re: George C]
    cmguy Offline
    Member

    Registered: 03/30/14
    Posts: 387
    Just an FYI - a GAI of 145+ on the WISC gets one well on the way qualifying for Davidson Youth Scholars.

    Top
    #213360 - 03/27/15 06:37 PM Re: How to calculate GAI? [Re: George C]
    George C Offline
    Member

    Registered: 03/12/15
    Posts: 282
    Cmguy,

    Thanks for the info about DYS. I had been under the impression that he wouldn't qualify on account of his FSIQ being 1 point too low. So GAI can be used instead? Even if so, it still seems like he would be on the "low" end of the program? It seems like its target is for the more profoundly gifted child.

    He hasn't taken any achievement tests yet, though we are considering it, mainly because we suspect he may be underachieving.

    Top
    #213362 - 03/27/15 11:21 PM Re: How to calculate GAI? [Re: George C]
    it_is_2day Offline
    Member

    Registered: 08/14/14
    Posts: 149
    Just a statistical thought.

    This is a more a fact about the shape of the bell curve than anything. If everybody with an IQ of 145 or above is segmented off into a second population. Most of the individuals in that second population will be very near 145. In other words the density becomes rapidly more sparse as you get much higher than 145.


    Edited by it_is_2day (03/27/15 11:21 PM)

    Top
    Page 1 of 2 1 2 >


    Moderator:  M-Moderator 
    Recent Posts
    NYC pivots on admission criteria
    by indigo
    Yesterday at 12:11 PM
    The ultimate brag thread
    by LazyMum
    Yesterday at 03:07 AM
    How do you choose a profession?
    by LazyMum
    09/30/22 04:13 AM
    Introduction
    by indigo
    09/24/22 08:17 AM
    Math acceleration and teacher attitude questions
    by AlanLuiz
    09/23/22 10:52 AM
    Davidson Institute Twitter