Can any one tell me the meaning of the sentence showed by astrik mark?
The CTS (classical true score messurement theory) is a special case of G-theory(generalizability theory) in which there are only two sources of variance : a single ability and a single source of error. Thus as well as identifying particular sources of error with the construction phase, *the need for each such source is extrapolated backwards from the use to which the test is to be put.*

Question

Can any one tell me the meaning of the sentence showed by astrik mark?
The CTS (classical true score messurement theory) is a special  case of  G-theory(generalizability theory) in which there are only two sources of variance : a single ability and a single source of error. Thus as well as identifying particular sources of error with the construction phase, *the need for each such source is extrapolated backwards from the use to which the test is to be put.*

Answer

Gosh! This is hard, without any context.

I don't understand the topic really. But I can rewrite the last sentence, and see if it helps you:
"*the need for each such source is extrapolated backwards from the use to which the test is to be put.*"
=>
"if you find out what the test is going to be used for, you can then work out whether each source is needed".

Does that help?!

Answers · 1

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