32. Supplementary memorandum submitted
by Ian Schagen (DP 50)
NOTES ON
VALUE-ADDED
FROM KS2 TO
GCSE FOR SELECTIVE
AND NON-SELECTIVE
SCHOOLSREQUESTED
BY COMMITTEE
ON 27 NOVEMBER
2002 (QUESTION 221)
Interest was expressed by the Select Committee
on the underlying data behind the modelling of the impact of selective
schools on value-added performance from KS2 1996 to GCSE 2001.
The following table shows the raw results, in terms of GCSE total
point score, for selective and non-selective schools, broken down
by KS2 average level. It also indicates the numbers of pupils
in the dataset at each level. The figure displays these results
graphically.
KS2 | Non-selective schools
| Selective schools |
average
level | Mean
total
score
| No of
cases | Mean
total
score
| No of
cases |
2.00 | 11.28 | 9,682
| | |
2.33 | 13.88 | 8,680
| | |
2.67 | 17.84 | 17,933
| | |
3.00 | 24.60 | 57,608
| | |
3.33 | 31.71 | 46,338
| | |
3.67 | 37.90 | 55,860
| 52.96 | 332 |
4.00 | 45.07 | 85,748
| 55.37 | 2,517 |
4.33 | 52.42 | 38,634
| 59.79 | 3,447 |
4.67 | 57.91 | 23,012
| 63.79 | 3,542 |
5.00 | 64.33 | 13,527
| 68.73 | 3,138 |
5.33 | 71.24 | 443
| 73.14 | 143 |
Very similar results are found for average GCSE point score.
It should be noted that the above table and figure are based
purely on raw data, and take no account of a range of background
factors which are included in the sophisticated multilevel modelling
which has been carried out and reported previously (see Schagen
and Schagen, 2002). In particular, it takes no account of the
percentage eligible for free school meals, which has a significant
effect on value-added performance. In general, selective schools
tend to have much lower levels of free school meal eligibility.
December 2002
REFERENCES
SCHAGEN, I. and SCHAGEN, S. (2002) "Using national value-added
datasets to explore the effects of school diversity", presented
at BERA 2002, University of Exeter, September 2002.
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