2010 PSLE Discussion

[mellette]

atutor2001:

ctct61t:

Thank atutor2001, it's very clearly explained my question...do you know what the A*, A, B, C...score is?

If there is no change, the scores should be :

A* > 91
A 75 - 90
B 60 - 74
C 50 - 59
D 35 - 49
E 20 - 34
U < 20

Hi, My son got A* for Maths, A for English and A for Science.. based on the worst case scenerio he should be getting 240, however he only returned a 230 by MOE. He is exempted from MT..

Need advise as to should I appeal ..becos the 10 pionts make a huge difference in school application.

Thanks all

[atutor2001]

mellette:

Hi, My son got A* for Maths, A for English and A for Science.. based on the worst case scenerio he should be getting 240, however he only returned a 230 by MOE. He is exempted from MT..

Need advise as to should I appeal ..becos the 10 pionts make a huge difference in school application.

Thanks all

I think the method for computation of aggregate T-score for students taking 3 subjects is different from those taking 4 subjects.

Based on A*, A & A, the \"worst-case\" total raw score is 241, giving an average of 80.3 marks per subject and an average of 59.42 T-score per subject.

With only 3 subjects, the total T-score will be only 59.42 x 3 = 178.26, which cannot be used to compare with other students whose aggregate T-score is based on the total of 4 subjects.

My guess is that since MT is exempted, MOE will award a T-score of 50 (which is the equivalent of getting the average mark) for MT. So the modified T-score for comparison with those with 4 subjects will be 178.26 + 50 = 228.26, which is quite near to your son's T-score (i.e. his raw-scores are better than the worst case scenario)

Hope my guess makes sense.

[jtoh]

atutor2001:

mellette:

Hi, My son got A* for Maths, A for English and A for Science.. based on the worst case scenerio he should be getting 240, however he only returned a 230 by MOE. He is exempted from MT..

Need advise as to should I appeal ..becos the 10 pionts make a huge difference in school application.

Thanks all

I think the method for computation of aggregate T-score for students taking 3 subjects is different from those taking 4 subjects.

Based on A*, A & A, the \"worst-case\" total raw score is 241, giving an average of 80.3 marks per subject and an average of 59.42 T-score per subject.

With only 3 subjects, the total T-score will be only 59.42 x 3 = 178.26, which cannot be used to compare with other students whose aggregate T-score is based on the total of 4 subjects.

My guess is that since MT is exempted, MOE will award a T-score of 50 (which is the equivalent of getting the average mark) for MT. So the modified T-score for comparison with those with 4 subjects will be 178.26 + 50 = 228.26, which is quite near to your son's T-score (i.e. his raw-scores are better than the worst case scenario)

Hope my guess makes sense.

I'd like to offer an alternative view to yours. I know of several students who are exempted from mother tongue. All of them did far better than expected at PSLE. Based on our rough calculations, it would appear that their t-score was calculated based on the 3 subjects alone, and not with an average MT score added in.

[autolycus]

All subjects at PSLE are accorded ‘equal weighting’ in the sense that the aggregate score is the sum of all the t-scores without any extra ‘bias’ or ‘weighting’ assigned to any subject.


For students with no MTL (exempted), the aggregate is computed by multiplying by 4/3 so that the three remaining subjects will now have the ‘weight’ of 4 subjects.

[atutor2001]

atutor2001:

My analysis to estimate the average and stardard deviation based on feedback we got here :


T-score 282 (assuming that the raw score is 99 for every subject)
T-score 263 with 4A* (assuming that the raw score is 91 for every subject)

Based on the above assumptions, the \"average\" mean per subject is about 64 and the \"average\" standard deviation i.e. spread is about 17 marks.

Very surprised that the sd (spread) is so big.

There is another case where 3A* & 1A gets 249. Based on my above estimates for mean and SD, the T-score will be about 254. Therefore, the above estimates are quite off.

I have adjusted the assumption for the average raw score from 91 to 92 for the T-score of 263. That gives the following new estimates of the mean and SD :

Mean is about 68.8
Sd is about 14.7

With this mean and SD, the 3A* & 1A will be about 249.5.
Therefore, I think for future estimation of T-score, we can use

Mean = 69 and SD = 15

[atutor2001]

autolycus:

All subjects at PSLE are accorded 'equal weighting' in the sense that the aggregate score is the sum of all the t-scores without any extra 'bias' or 'weighting' assigned to any subject.


For students with no MTL (exempted), the aggregate is computed by multiplying by 4/3 so that the three remaining subjects will now have the 'weight' of 4 subjects.

Hi autolycus

You are right. I used my new estimates for the means and SD and the T-score for the worst case of 1A* & 2A comes out to be 230.22 based on the average of the 3 subjects to get aggregate of 4 subjects.

[mum-to-2]

my ds got into express with a score of 200. he wont be able to get into his affiliated secondary school since the school’s COP is 225. does this mean i should not even list it as his first choice?


schools in our list include:
pierce cop 208
monfort cop 206
holy innocent cop 219
guangyang cop 203
chong boon cop 190
bartley cop 193
ankss cop 227
mayflower cop 222
beatty cop 217

appreciate your advice thanks!

[JonC]

@atutor


Here are few cases I know,

3A. 1B 230 and also 220

3A, 1A* 243 and also 230

Does this help you to fine tune further?

But not every subject will have the same Mean and SD right?

[verykiasu2010]

atutor2001:

atutor2001:

My analysis to estimate the average and stardard deviation based on feedback we got here :


T-score 282 (assuming that the raw score is 99 for every subject)
T-score 263 with 4A* (assuming that the raw score is 91 for every subject)

Based on the above assumptions, the \"average\" mean per subject is about 64 and the \"average\" standard deviation i.e. spread is about 17 marks.

Very surprised that the sd (spread) is so big.

There is another case where 3A* & 1A gets 249. Based on my above estimates for mean and SD, the T-score will be about 254. Therefore, the above estimates are quite off.

I have adjusted the assumption for the average raw score from 91 to 92 for the T-score of 263. That gives the following new estimates of the mean and SD :

Mean is about 68.8
Sd is about 14.7

With this mean and SD, the 3A* & 1A will be about 249.5.
Therefore, I think for future estimation of T-score, we can use

Mean = 69 and SD = 15

don't think this is reasonable

every subject's mean and their SD is different, and it fluctuates from year to year

this year's mean for all subjects are definitely higher than last year as the papers were easy, and the SD must have been narrowed too.

giving you as examples below :

NYPS 2010 Prelim including GEP of about 100, total cohort size 472 :

Mean for EL is 79.97 and SD is 8.99

Mean for CL is 73.47 and SD is 11.53

Mean for MA is 65.80 and SD is 17.93

Mean for SC is 68.69 and SD is 13.45

all rounded to nearest 2 decimal; at least 82% got A / A* for all subjects

NYPS is one of largest Pri 6 cohort and its numbers should be quite representaive

there is also a student with 3A* + 1A = 262, compared with the 249 quoted above

[sautille]

verykiasu2010:

there is also a student with 3A* + 1A = 262, compared with the 249 quoted above

Just to add to the confusion...my son's classmate has 3A*+1A and a T-score of 269 (without HMT).