Reply to CoGAT: raw to scaled score?

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Reply to "CoGAT: raw to scaled score?"

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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]I don't think the raw to scaled score is a simple conversion of "For this birth month, it's this many points off per question."

It's more like "What is the likelihood of a child with this birth month getting this many questions right?" It's stats, not a simple 160 - number wrong * x.[/quote]

It is this.  They have several different norming groups for each age bracket.  If your kid is 7 years + 5 months, they'll be compared against the norming group of kids who are 7 years + 3 months through 7 years + 5.999 months, assuming that they use 4 norming groups for each year.  [/quote]

It's not a formula though - probably a chart like:

Number |  Age        | Age
Correct  |  7.0-7.25 |7.25-7.5
50         |  150        |  146
49         |  145        |  140
48         |  142        |  139
etc...[/quote]

Well yes.  It's not a formula.  It's a norming group, as I said in the quoted post.  Like, if they are norming against 10000 kids to find the rarity of each score, they'll have 10000 kids of age 7 years 0 months - 7 years 2.99 months in the norming group.  [/quote]

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