age standardisation
Posted: Mon Jul 14, 2014 11:44 am
can anyone tell me in terms of actual points how many more a mid August child would be awarded for AGGS?
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Oshosh wrote:Hello, i asked this question last year on the forum.....evidently it is very diffcult to answer. However there was formula on this site, which i found useful, and used that as rough measurement of DS standardized score, however that formula is not for age standardization but only taking the mean score of 100....so it is not accurate, but gave me a some sort of idea. I will post the formula if i find, but it should on this website.
As scary mum says above, the idea of age standardisation is that children are compared with those of like age, crudely the September-born with the September-born, the December-born with the December-born and so on. That will give for each subgroup a mean and standard deviation. The mean raw score for each group will be the standardised score of 100 for that group; the underlying raw scores for any given standardised score will depend on the mean and standard deviation (and may/will be different for each group and may / will be higher for the Septembers than the Augusts), but when all the standardised scores are put in one long ranked list, two scores the same - say 115 - are now equal, regardless of the fact that one child got a raw score of, say, 60% and the other got 65%.Olliesmum wrote:If both children in this example – the oldest one and the youngest one – achieve the identical “raw score”, the youngest child’s final 11+ score will be higher than that of the oldest child. The standardisation process has “awarded” extra marks to the younger child to compensate for their younger age. Every test paper is unique in the factors that go into standardising it but if both children achieved a raw score of 75/80, a very rough outcome could be that the older child’s standardised score might be approximately 133, while the younger child’s score could be around 136. (Please note that these figures are given as examples only and do not represent actual marks.)
I have just found this... would it mean that my DS - whose birthday is in September, 'could' have been awarded a few less marks than others at the standardisation process? ("To make it fair for younger boys"??)
You do know that this thread is from 2014?Mandy21 wrote:Olliesmum - I imagine all schools use the same process and the headmaster at AGSB was quizzed on it at the open evening I attended. He said it would make a difference of 1 or 2 marks at most.
If you're asking on the basis of using it as an argument in an appeal, as Tiddlymum says there are other areas which would be more likely to influence the panel than standardisation I would think.
Oshosh - I got Data Protection details of my DD's raw scores from both CEM tests she took. The cohort average was presumed to be 55%. After wide spread reporting that the CEM exams were easier, people suggested at one point raw score cohort averages might be as high as 60%.Oshosh wrote:Oshosh wrote:Hello, i asked this question last year on the forum.....evidently it is very diffcult to answer. However there was formula on this site, which i found useful, and used that as rough measurement of DS standardized score, however that formula is not for age standardization but only taking the mean score of 100....so it is not accurate, but gave me a some sort of idea. I will post the formula if i find, but it should on this website.
If no age allowance were to be applied to the standardised scores, then the equation for converting raw scores to standardised scores with a mean (average) score of 100 is
S = 15(b — a)/sd + 100
where S is the pupil’s standardised score, b is the pupil’s raw score, a is the average raw score of all the pupils, and sd is the standard deviation of the raw scores.
I took SD as 15, average raw score of all pupils as 45 for an 80 questions paper, and 50 for 85 questions paper.
This is only rough estimate....by no means accurate.....