Calculating moderated assessment mark? (1 Viewer)

[Anon9796]

If I have all the internal school assessment + external hsc exam scores and ranks of a particular class, is it possible to then work out the moderated assessment marks of all the students? If so, how?

 

[Dylanamali]

you could probably do it.. wouldn't be 100% accurate, but i'd say you could be as close as 1 or 2 off for each student.
But you could never attain all that data.. BOS doesn't give out external hsc exam scores to other students..

 

[someth1ng]

If I have all the internal school assessment + external hsc exam scores and ranks of a particular class, is it possible to then work out the moderated assessment marks of all the students? If so, how?

Yes, it is possible but would be quite a hassle - you would need to know if a result(s) is deemed as an outlier as well.

1. If you look at the external HSC scores, grab the highest and lowest score.
2. The highest score goes to rank 1 internally and lowest score goes to rank X internally.
3. Look at the RELATIVE DIFFERENCE (ie gaps) of the internal un-moderated score and apply the same gaps to the students to obtain the moderated internal marks.
4. Now, check the relative differences in the moderated scores as they should be equivalent to the relative differences of the un-moderated scores.

You now have the moderated internal marks.

 

[Anon9796]

The calculation becomes much easier if u know statistics stuff like standard deviation...

1) Calculate the mean of external marks and internal marks.
2) Calculate the standard deviation for both external and internal marks. (Standard deviation is the spread of scores)
3) Convert every raw internal mark into z-scores (ie.... how many standard deviations is the raw internal mark from raw internal mean?... I forgot the formula for this.... but it's quite simple)
4) add the z-score times standard deviation of external marks (or minus..... depends is the z-score is plus or minus) to the mean of the external mark

And you get moderated marks........ this is quite similar to a process called "Standardisation".


EDIT: This might be similar to what UAC does..... BUT...... instead.... UAC moderates subjects..... ie...... UAC might perhaps set english to be the yard-stick/ mean @ scaled mark of 25/50 per unit (25/50 is what u get after finding mean score of total of advanced and standard english students)....then UAC might find the standard deviation of raw marks of english paper one..... the UAC then finds the relative gap between a subject and english and adjusts that subject's scaling accordingly.

thanks to all answers

@utopian radical
i lost you at step four..
what do i do with the internal z scores and the mean and sd of the external marks?

 

[slyhunter]

Why would you want to do such a thing though?

 

[RealiseNothing]

I'm repping you just because of how long that would of taken.

 

[Lazarus]

YES!!!!! I found this!!!!

...

In technical terms, it uses a linear transformation to adjust the school-based assessment distribution for a subject in a school to have the same mean and standard deviation as the distribution of examination results for that subject achieved by students at that school.

This is not correct.

Although that method may be used by other institutions in other circumstances, it is not used by the Board of Studies NSW to moderate raw school assessment marks. The moderating procedure uses a quadratic function and is non-linear.

You can verify that the transformation is non-linear by inspecting the conversion graph at the bottom of this page. It is a curve rather than a straight line.

The detail of the procedure is explained in the following technical paper, a copy of which is attached to this post:

MacCann, R.G. 1995, The Moderation of Higher School Certificate Assessments using a Quadratic Polynomial Transformation: a Technical Paper, NSW Board of Studies, Sydney.

We implemented a crude web app some years ago to allow students to experiment with the moderating procedure by entering different marks, but it seems to have ceased functioning through the various site upgrades. Perhaps someone can recreate it.

Attachments: View attachment MacCann RG, Moderation Technical Paper (1995) Board of Studies NSW.pdf

 

[b00m]

This is not correct.

Although that method may be used by other institutions in other circumstances, it is not used by the Board of Studies NSW to moderate raw school assessment marks. The moderating procedure uses a quadratic function and is non-linear.

You can verify that the transformation is non-linear by inspecting the conversion graph at the bottom of this page. It is a curve rather than a straight line.

The detail of the procedure is explained in the following technical paper, a copy of which is attached to this post:

MacCann, R.G. 1995, The Moderation of Higher School Certificate Assessments using a Quadratic Polynomial Transformation: a Technical Paper, NSW Board of Studies, Sydney.

We implemented a crude web app some years ago to allow students to experiment with the moderating procedure by entering different marks, but it seems to have ceased functioning through the various site upgrades. Perhaps someone can recreate it.

Attachments: View attachment 24602

our father, who is arthur in heaven..