We have all come to the conclusion you need to work for NFER to find out how the birthday points (standardised score) actually works..
Here is a post from the Bucks section where somebody asked a similar question. Bucks is the closest format to Wirralâ€™s 11+, 2 VR papers, 80 questions, 50 mins to answer them.
Hope these help explain the in explainable..
Ooooh - my favourite subject!
Standardisation is a dreadful concept, and I think most of us really have only the haziest idea how it really works. For a full understanding, try here, and the NFER link from that page:http://www.elevenplusexams.co.uk/standardised_scores.php
If you fall at the first hurdle on all of that (as I always have done), the approximate pass mark for Bucks is 86%. A November birthday will need to score around 90% to pass.
And I totally agree with the reply from gfp.
Standardisation is a dreadful concept, and I think most of us really have only the haziest idea how it really works.
I think the reason that most of us have only a hazy idea of how it works is that we're not being told!
The links you give only tell us why standardisation is applied. The NFER website's page on "age standardisation" pretends to explain it but it gives a standardisation formula that takes no account of age and a useless table. We all know actual figures vary each year but NFER must have plenty of historical data that could be used to illustrate now age standardiation works.
The bit that worries me from the above page is
"This is because pupils are, in effect, only being compared with other pupils of the same age as themselves."
"in effect"! Does that mean that they're not actually "only being compared with other pupils of the same age"? Are they just applying some previously calculated penalty to give the effect?
I would like to read some published research into how test scores vary with age and how the correction is applied, but maybe I'm just a glutton for punishment.
Sorry I couldn't help you anymore..