M.Greenaway. Analysing Data. Looking at the use of data to monitor the achievement of pupils and departments. Baseline Data. 12+ Reading Score KS2 or KS3 Mathematics Result Average KS2 or KS3 Result Previous examination result Mathematics NFER test result
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In this case 12+ reading scores
Student A achieved 20 marks over the 4 subjects which gives an average of 5 (Grade C)
Student B achieved 16 marks over the 4 subjects which gives an average of 4 (Grade D)
Then student A has a Maths score of 5 and an average of 5 so there is no difference
Then student A has a Maths score of 5 and an average of 5 so there is no difference (Residual = 0)
Student B has a Maths score of 3 and an average of 4 so his Maths score is 1 grade below
Student B has a Maths score of 3 and an average of 4 so his Maths score is 1 grade below (Residual = -1)
0 + -1 + 0.2 + 0.5 + 0.7 + 0.5 + 0.5 = 1
On average every student achieves 1/7 = 0.14 of a grade higher in Maths than they do in their other subjects.
Although this does not sound very much, if you had a year 11 with 175 students this would correspond to an extra 25 grades which is significant in itself and reflects a strong department.
But at best it could mean 25 students gaining a C in Maths compared to a D in their other subjects - This could make the Maths A* - C result 14% higher than other departments.
Average Residual = 0.5
Percentage of C+ Grades = 40%
Average Residual = -0.5
Percentage of C+ Grades = 90%