Gifted Adult's Inventory of Aspergerisms (GAIA) - Statistical Report

This is the statistical report of a personality inventory relating to Aspergoid features in intelligent adults.

Norms

Note: The t-scores, with mean of 50 and standard deviation of 10, are based on a recent sample (2008), and anchored to the P.S.I.A. Aspergoid scale. Therefore these t-scores reflect where one stands among intelligent adults in general, and not just among a group pre-selected for interest in Asperger Syndrome (which - the latter group - have considerably higher scores on average).

Scores

Note: These scores are from candidates who chose to take this test, probably from an interest in Asperger Syndrome, and their scores are higher on average than those of a more general group of intelligent adults would be - see above t-scores.

• # candidates: 106
• Median: 22.5
• Quartile deviation: 9.5
• Range: 44
• Maximum possible: 54
• Mean: 21.6
• Standard deviation: 10.88
• Male median: 22.0
• Female median: 28.0 (# females: 25)
• Hardness: 0.58
• Resolution: 0.59

Scores by males

n = 81

Scores by females

n = 25

Correlation with other tests

Weighted average of correlations: -0.216

Conservatively estimated minimum g loading: -0.47

Ranking in above table is based on the unrounded correlations. All available data is present in this table, no tests are left out except for those with less than 5 score pairs. All known pairs are used to obtain the true, honest statistics; Correlations have not been artificially inflated by leaving out ceiling scores, outliers or other anomalies.

National medians

For reasons of privacy, only countries with 2 or more candidates are included in this table. Ranking is based on the medians, and then alphabetic.

Correlation with personal details

The high positive correlations with Disorders and P.S.I.A. Deviance reflect the validity of the GAIA as a measure of disposition for psychiatric disorders. The negative correlations with the three measures of Educational level are related to the negative correlation between GAIA and I.Q. (Educational level correlates positively with I.Q.).

Correlation with personal details - within females

Correlation with national I.Q.s

Correlation of this test with national average I.Q.s published by Lynn and Vanhanen:

• r = 0.06 (n = 63)

Estimated g factor loadings Upward and Downward of specific scores

In parentheses the number of score pairs on which that estimated g factor loading is based. The Upward and Downward values are calculated including the pertinent score itself. It is normal that g factor loadings go down when the range is restricted like this, but careful study of the Upward and Downward columns may reveal possible scores below or above which the test loses validity altogether.

Note: It can be deduced from this table that the g-loading of GAIA scores is lowly negative on the whole, but rises to highly negative as the scores go up. Also, that the g-loading is moderately positive between scores of 5-10 to 15-20; in other words, in the range where most people are not disordered and not deviant.

Reliability

• Split-half = 0.89
• Cronbach's alpha = 0.87

Note: This reliability is high for a non-intelligence personality test, and reflects the fact that the individual items almost all have clear positive correlations with total score. The combination of high reliability and negative g-loading is remarkable, and reveals the reality of the negative impact that deviance and disorders have on intelligence. This is important in understanding the rareness of genius, as discussed in Rareness and discontinuity of genius.

Error

• Standard error = 3.1 raw score points
• Quartile error = 1.8 raw score points
• Range of error = 13.2 raw score points

Scores by age

Scores by age - within females

Robustness and overall test quality

• Robustness = 0.96
• Quality = 0.75

Item analysis

• Hardness = Proportion of candidates not checking that item
• Cor = Correlation with GAIA score

Early GAIA statistical report (2001)

Scores out of 54 after removal of items 15, 27, 30 31, 35 and 40 (202 submissions, median score 23):

01**
02*
03***
04**
05*
06**
07*****
08***
09***** **
11*****
12***** *
13***
14****
15*
16***** ****
17***** **
18***** ****
19***
20***** ***
21***** *****
22***** ***
23***** ***** *
24***** ***** *
25***** ***
26***** ***
27*****
28***** *
29*****
30***** *
31***
32*****
33***** ***
34*****
35*
36***
37*****
39***
41*
42**
44*
45**
49*
51*
53*
54*

Males: 132, median 22
Females: 63, median 23

Norms

Note: The t-scores, with mean of 50 and standard deviation of 10, are based on a more recent sample (2008), and anchored to the P.S.I.A. Aspergoid scale. Therefore these t-scores reflect where one stands among intelligent adults in general, and not just among a group pre-selected for their interest in Asperger Syndrome (which - the latter - do the centiles which are based directly on the GAIA candidates). The t-scores are for that reason the most informative to learn where one stands among a more general population.

Diagnoses

Major problems in life

Item analysis

(60 items, 24 submissions with median score 25)

# = item number (in parenthesis the new item number after revision)
P = %age of candidates checking that item
M = Median score of those checking the item