Hi,
A related question I have is how stable are these test scores over time?
I found a recent study
https://www.tandfonline.com/doi/full/10.1080/21622965.2021.1875827 that suggests that WISC-V test and retest FSIQ scores have a 0.86 correlation with an average gap of 2 years for a sample of kids aged 6 to 15 (N=225)
This is helpful, but I am specifically interested in the correlation between adult and child IQ - so if I get a WISC-V score for a six year old, how predictive is it of their aptitude at age 18?
I imagine these studies are hard to do well, but someone must have done something...
