KelliB, I've tried to figure out how to calculate the "Broad Scores," too, because DS5 took the WJ-III Ach. when he was 4.5 y.o. to get into a summer program. From what I understand, he took all of the subtests to have the "Broad Reading" and "Broad Math" calculated. He did very well, but at the time, I had no reason to have "Broad Scores" calculated - so they never were. The person who gave the test has since retired and I don't think it would be easy to have this same person calculate the scores.
I'd love to know if there was a way to calculate the broad scores without having to go pay someone else to do it. Like you, I've searched, but have never had them calculated because I have no idea how to do it! I strongly suspect that at least the reading scores would be very high (this was before DS became very interested in math, so these were lower). I doesn't look like any "writing" subtests were given, but this makes sense, given his age at the time of testing.
Does anyone know if achievement scores performed at 4.5 y.o. would be valid for DYS anyway, or does the child need to be 5 y.o. when the test is done?
I also would love to know if anyone here knows how to calculate broad scores!
