All About T-Score

[hoskins8h]

verykiasu2010:

o i c!

the mean and SD is specific to the cohort in the school and is different for each subject in each exam

for P5, the mean ranges from 65 to 75 and the SD ranges from 9 to 17, cohort size approx 400, excluding GEP

the numbers are similar for P6 SA1, and the median is higher than the mean

all the numbers are from the school

Unfortunately my child's school does not provide SD but a graphical distribution of marks so need to manually estimate the SD. Just to check if my estimates are in the ball park, maths is generally the one with the high SD (say 12-18) and the others are lower (say 8-12)? This would be for P5 and P6 CA, SAs.

[harish_thiyagrajan.023307hotmail.023307com]

If I get

Maths=91
Science=90
MT=85
English=80
What will my T-score be?

[Sun_2010]

Au:

If I get

Maths=91
Science=90
MT=85
English=80
What will my T-score be?

Au,

U need to have the mean and the Standard deviation of ur cohorts in ur school. Most schools dot give SD but probably give u the class ave
So u cannot calculate the T-score

[MOE Hater]

Sun_2010:

Au,


U need to have the mean and the Standard deviation of ur cohorts in ur school. Most schools dot give SD but probably give u the class ave
So u cannot calculate the T-score

If you convert your score out of 400 to out of 300, you can find your raw score. If you get an A* it i most likely your overall percentage for t-score would be an A*

[atutor2001]

MOE Hater:

If you convert your score out of 400 to out of 300, you can find your raw score. If you get an A* it i most likely your overall percentage for t-score would be an A*

Hi MOE Hater

The above method for estimating aggregate used to be quite accurate in the past as the \"means\" of all subjects were around 70 to 75. However, it is not so anymore. With the increase in the \"means\" for math and Chinese, any student who does not perform well enough in either of these subjects will find their aggregate T-score being pulled down disproportionately. My friends' kids suffered such fate last year. A low \"A\" in any one of those 2 subjects can bring the overall T-score down by as much as 5 to 10 points, compared to a student with the same results in the past. The drop will be greater when the standard deviation is bigger.

[IsaacTham]

thanks for all the information on T-scores but i’m concerned about grades.


From what i know it is by bell curve. But how many ppl get A* each year? The top 10%? Does it follow the marks? (A* 91%tile -100%tile A 75%tile to 90%tile)

Thanks. Because i find it quite difficult to get A* for CL especially with the exam format change.

[MOE Hater]

Grades are based on the raw score but cut off marks for grades are moderated depending on the level of difficulty of the paper

[Fongg]

atutor2001:

The above method for estimating aggregate used to be quite accurate in the past as the \"means\" of all subjects were around 70 to 75. However, it is not so anymore. With the increase in the \"means\" for math and Chinese, any student who does not perform well enough in either of these subjects will find their aggregate T-score being pulled down disproportionately. My friends' kids suffered such fate last year. A low \"A\" in any one of those 2 subjects can bring the overall T-score down by as much as 5 to 10 points, compared to a student with the same results in the past. The drop will be greater when the standard deviation is bigger.

Hi atutor,

Can I find out more about this, i did not know that now the means for chinese and maths is higher so does that mean that they are more important than english and science? (their weightage higher?)

[verykiasu2010]

In every cohort the performance is different hence the mean fluctuates


If it has been higher it is due to change in exam format and / or how the bell curve is drawn

Every subject is still of equal weightage

Don’t forget the recent hoohah on the proposed lesser weightage on MT

[MOE Hater]

verykiasu2010:

I think it is not possible to have t-score of more than 75 for any subject.


Max t-score for each subject is 75. Max aggregate is 300.

http://road-to-psle.blogspot.com/2007/11/how-psle-aggregate-and-t-scores-are.html

Of course it is possible to get more than 75