SRA-F Stats

SRA-F Statistics

Last Revision : November 1st, 2017.

1. 3rd Norm

Raw Score IQ (sd15) Rarity (1/x) Raw Score IQ (sd15) Rarity (1/x)
6 <120 15 145 741
7 120 11 16 150 2,330
8 125 21 17 153 4,873
9 128 32 18 158 18,120
10 131 52 19 161 41,916
11 133 72 20 166 184,606
12 135 102 21 172 1,258,887
13 138 177 22 175 3,483,046
14 142 391 23 >=178 10,016,587

2. Histogram

histogram

3. Statistical Properties & Correlations with other tests
Calculated mean on reported scores on standard supervised tests is 140,583 sd15 (N=13). Mean raw score of this sample on SRA-F is 13,73.

Parameter Value Test Score Pairs (n) r
Mean 13,32 WAIS 6 0,847
Median 13
Stand. Deviation 3,652 Standard* 13 0,834
Variance 13,338
SEM 0,424 Jouve** 14 0,714
Kurtosis -0,515
Skewness -0,116 RAPM 4 0,635
Cronbach’s a 0,889

* Tests used : WAIS, RAPM, FRT-B, CFT20R.
** Tests used : JCTI, CSE, TLAP-R, JCCES.

4. Notes
As seen above, SRA-F shows both high correlation with standard supervised IQ tests and high reliability. This test proved to be harder than expected, probably among the hardest online (LS24 is probably one of them); in fact, simple ideas are hidden in its items. The gap between top score (21) and total number of items (32) is relatively big. Next norm, at 100 candidates, will surely be of interest.

Advertisements