Conversion between Sutton Grammar and Wilsons scores
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Conversion between Sutton Grammar and Wilsons scores
This would help people who are trying to convert between Sutton Grammar and Wilsons scores.
Median Scores Example
The following case explains the scenario for a student who scored exactly median marks in all exams:
Stage 1 SET
SET maths restandardised (A): 100
SET English restandardised (B): 100
Stage 2
Maths standardised (C): 100
English standardised (D): 100
SGS Total stage 2 score: 60% of A + 60% of B + 90% of C + 90% of D = 300
Wilsons Total Stage 2 score: 50% of A + 50% of B + 200% of C + 200% of D = 500
Realistic Example
Here is an example with real numbers:
SET Stage 1 calculation
Stage 1 Maths raw : 47/50
Stage 1 English raw : 58/65
Maths standardised : 125.85
English standardised: 122.26
Total standardised: 248.11
SGS cut-off 213
Stage 2
SET maths restandardised (A) : 123.09 (Note that these marks are likely restandardised because there are roughly 900 children left (out of 3000) after sifting in SET Stage 1)
SET English restandardised (B): 123.18
Maths Stage 2 raw: 37/40
English Stage 2 raw: 145/150
Maths standardised (C): 123.96
English standardised (D): 137.17
SGS total stage 2 score: 60% of A + 60% of B + 90% of C + 90% of D = 382.78
Wilsons total stage 2 score: 50% of A + 50% of B + 200% of C + 200% of D = 645
To convert from SGS to Wilson or vice versa, you need the standardised scores for both stages, referred to as A, B, C, D in above calculations.
Median Scores Example
The following case explains the scenario for a student who scored exactly median marks in all exams:
Stage 1 SET
SET maths restandardised (A): 100
SET English restandardised (B): 100
Stage 2
Maths standardised (C): 100
English standardised (D): 100
SGS Total stage 2 score: 60% of A + 60% of B + 90% of C + 90% of D = 300
Wilsons Total Stage 2 score: 50% of A + 50% of B + 200% of C + 200% of D = 500
Realistic Example
Here is an example with real numbers:
SET Stage 1 calculation
Stage 1 Maths raw : 47/50
Stage 1 English raw : 58/65
Maths standardised : 125.85
English standardised: 122.26
Total standardised: 248.11
SGS cut-off 213
Stage 2
SET maths restandardised (A) : 123.09 (Note that these marks are likely restandardised because there are roughly 900 children left (out of 3000) after sifting in SET Stage 1)
SET English restandardised (B): 123.18
Maths Stage 2 raw: 37/40
English Stage 2 raw: 145/150
Maths standardised (C): 123.96
English standardised (D): 137.17
SGS total stage 2 score: 60% of A + 60% of B + 90% of C + 90% of D = 382.78
Wilsons total stage 2 score: 50% of A + 50% of B + 200% of C + 200% of D = 645
To convert from SGS to Wilson or vice versa, you need the standardised scores for both stages, referred to as A, B, C, D in above calculations.