One reason SAT1600 and SAT2400 scores may differ is that some of the SAT1600 scores might in fact have come from before the 1994 renorming. Have you tried doing pre-1994 and post-1994 scores separately (guessing when someone took the SAT based on age?)
Average SAT for LWers 30 and under (217 total): 1491. (27 1600s.)
Average SAT for LWers 31 to 35 (74 total): 1462.7 (9 1600s.)
Average SAT for LWers 36 and older (81 total): 1437. (One 1600, by someone who’s 56.)
I’m pretty sure the 36 and above are all the older SAT, suspect the middle group contains both, and pretty confident the younger group is mostly the newer SAT. The strong majority comes from the post 1995 test, and the scores don’t seem to have changed by all that much in nominal terms.
One reason SAT1600 and SAT2400 scores may differ is that some of the SAT1600 scores might in fact have come from before the 1994 renorming. Have you tried doing pre-1994 and post-1994 scores separately (guessing when someone took the SAT based on age?)
SAT1600 scores by age:
Average SAT for LWers 30 and under (217 total): 1491. (27 1600s.)
Average SAT for LWers 31 to 35 (74 total): 1462.7 (9 1600s.)
Average SAT for LWers 36 and older (81 total): 1437. (One 1600, by someone who’s 56.)
I’m pretty sure the 36 and above are all the older SAT, suspect the middle group contains both, and pretty confident the younger group is mostly the newer SAT. The strong majority comes from the post 1995 test, and the scores don’t seem to have changed by all that much in nominal terms.
Which creates another question, why do the SAT 2400 and SAT 1600 differ so much?