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Thread: Ext 2 Maths

  1. #51
    Retired Lazarus's Avatar
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    Essentially, yeah... put the marks into LazSeeker and look at the scaled marks they ended up as.
    Lazarus
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  2. #52
    Member Nelly's Avatar
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    I did that, but the thing is, in LazSeeker, the scaling is a bit off. If you plug like 85 into 4U math, you end up in the top 50% of the state, which is a bit weird.
    "You're theory of a donut shaped universe is intriguing Homer, I may have to steal it" - Stephen Hawking

  3. #53
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    That's actually correct, though. =)
    Lazarus
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  4. #54
    Member Nelly's Avatar
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    If you go furthur up, there is a guy that got 96.35. Why? He got really good marks for most things, and got better marks than the guy that got 97.05. What was the major difference between them?
    "You're theory of a donut shaped universe is intriguing Homer, I may have to steal it" - Stephen Hawking

  5. #55
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    You know how everyone is saying that 4 u pulls your uai high up, well I know a person from last year who reckons because she got a crapy mark for 4 u her uai actuall got pulled down.
    Last edited by Lugia; 21 Jul 2002 at 2:01 PM.

  6. #56
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    Copied from LazSeeker:

    Mathematics Ext1 4UC: 92 -> 93.200
    Mathematics Ext2 4UA: 83 -> 89.278
    Economics: 90 -> 83.526
    Business Studies: 90 -> 78.434
    English Advanced: 79 -> 69.904
    Legal Studies: didn't count
    Aggregate: 414.34
    Estimated UAI: 96.30
    Actual UAI: 96.35

    Mathematics Ext1 4UC: 93 -> 94.508
    Mathematics Ext2 4UA: 87 -> 92.380
    Chemistry: 79 -> 79.762
    Software Design & Development: 79 -> 77.749
    Physics: didn't count
    English Standard: 76 -> 74.419
    Aggregate: 418.82
    Estimated UAI: 96.80
    Actual UAI: 97.05

    As you can see, the first student had many of his marks scaled down to the level of the second student. You have to keep in mind that a course with 'good scaling' often means the marks were neither scaled up or down - very few courses are actually scaled up, so whether or not a course was 'scaled well' depends on how much it was scaled down by.

    Chem/phys are not scaled down nearly as much as busi/eco.
    Lazarus
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  7. #57
    Retired Lazarus's Avatar
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    Lugia - To be honest, that person doesn't sound like they know what they're talking about. In 2001, a mark of 78 would place someone in the bottom 25% of the state, and even that mark was still scaled up to ~85.
    Lazarus
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  8. #58
    Member Nelly's Avatar
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    I thought it was the raw mark that you put in. OK, well that seems better. How come Adv. English gets pulled down, whereas Standard English gets pulled up
    "You're theory of a donut shaped universe is intriguing Homer, I may have to steal it" - Stephen Hawking

  9. #59
    Retired Lazarus's Avatar
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    No, you put in the HSC mark. Students aren't even told their raw marks.

    A mark for English (Std) was only scaled up if you scored in the top 1% of the state. A mark for English (Adv) was scaled up if you scored in the top 9% of the state.

    For any particular subject, there isn't a 'set' amount of scaling that occurs across the entire spectrum of marks. There's usually a point at which your mark stays the same - above that, it gets scaled up, below that, it gets scaled down. That point corresponds to a different mark for every course.

    For English (Std), the pivot mark was 77. (99th percentile)
    For English (Adv), the pivot mark was 87. (91st percentile)
    For Chemistry, the pivot mark was 76. (72nd percentile)
    For Biology, the pivot mark was 95. (99th percentile)

    You can't compare scaling across courses simply by looking at marks - try mucking around with the 'Advanced' version of LazSeeker.
    Lazarus
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  10. #60
    Member Nelly's Avatar
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    I don't think I have the 'advanced' version.

    What were the pivot marks for 4U and 3U math???
    "You're theory of a donut shaped universe is intriguing Homer, I may have to steal it" - Stephen Hawking

  11. #61
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    The advanced version is just the online version with a few extra features added.

    You can access it via the LazSeeker website.

    Maths Ext1 (3UA) had two pivot marks, at 80 and 100.
    Maths Ext1 (4UC) had a pivot mark somewhere below 86.4
    Maths Ext2 (4UA) had a pivot mark significantly below 78.

    I don't have enough statistics to work out those last two exactly.
    Lazarus
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  12. #62
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    interesting.........I would think its harder to come in the top 9% for Advanced English compared to top 1% of standard
    All my life I've wanted to be someone; I guess I should have been more specific.

  13. #63
    Member Nelly's Avatar
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    Awesome stats, how did you gather all of them together?
    "You're theory of a donut shaped universe is intriguing Homer, I may have to steal it" - Stephen Hawking

  14. #64
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    I work most of them out myself, heh.

    I created graphs that show how each course was scaled in 2001... that way, you can simply look at where lines intersect to see pivot marks etc. I might upload them to the site.
    Lazarus
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  15. #65
    Member Nelly's Avatar
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    Thats psycho, maths is finally useful for something, hehe.
    "You're theory of a donut shaped universe is intriguing Homer, I may have to steal it" - Stephen Hawking

  16. #66
    New Member KilledInAction's Avatar
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    Yeh finally graphing actually comes in handy...
    I'm sure many ppl would be very interested to see the graph you created Lazarus.

  17. #67
    Member Nelly's Avatar
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    Yeah, post it up somewhere, so we can all marvel at your mathamatical mind. hehe.
    "You're theory of a donut shaped universe is intriguing Homer, I may have to steal it" - Stephen Hawking

  18. #68
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    You can view them at the following address -

    http://lazseekeronline.cjb.net/splines/

    The x-axis is the percentile at which a certain mark would have placed the student, and the y-axis is the mark between 0 and 50 (on a 1-unit basis).

    The red line represents HSC marks and the yellow line represents scaled marks.

    The graphs may be inaccurate in the 0 to 25 percentile range as there are no statistics available relating to the bottom 25% of the state - the program I used to generate them 'guessed' at where the curves would be in that range.
    Lazarus
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  19. #69
    Member Nelly's Avatar
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    Wholly crap, thats awesome. Compare General Math, to like 4U. hehe.
    "You're theory of a donut shaped universe is intriguing Homer, I may have to steal it" - Stephen Hawking

  20. #70
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    Out of all the marks I have, the following student did the most courses in common with yours, beebeez:

    Units | Course | Exam | Assess | HSC | Band

    2 Business Studies 89/100 91/100 90 6
    2 Economics 91/100 89/100 90 6
    2 English (Advanced) 80/100 77/100 79 4
    2 Legal Studies 69/100 74/100 72 4
    2 Mathematics Extension 1 91/100 93/100 92 E4
    2 Mathematics Extension 2 83/100 82/100 83 3 E3

    UAI 96.35
    (legal studies was not counted)

    _____________________________

    okay if i have 93 for bus, 90 for eco, 78 for adv eng, 80s for 3u and then 50s!! for 4u what u think i get...

    this is strange because dont they also look at your position too???

  21. #71
    Retired Lazarus's Avatar
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    You can see what UAI different combinations of marks might give you by using the LazSeeker program on the main Bored of Studies website.

    If by 'position' you mean assessment ranking, that is only used to turn your raw assessment mark into a moderated assessment mark. That moderated assessment mark is averaged with your aligned exam mark to give the HSC mark (which is what you enter into LazSeeker).

    No other position is used.
    Lazarus
    Et in arcadia ego...

  22. #72
    Member Nelly's Avatar
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    That's an awesome program, thanx man.
    "You're theory of a donut shaped universe is intriguing Homer, I may have to steal it" - Stephen Hawking

  23. #73
    New Member KilledInAction's Avatar
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    Yeh great stuff

  24. #74
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    Thumbs down

    Originally posted by KilledInAction
    Yeh great stuff
    I don't like your sarcasm KILLEDINACTION !
    IF your here to diss ppl get lost!

  25. #75
    Alumni Minai's Avatar
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    wat? another Big Willy?

    anyway, u cant get 50 (25/50 in 1U terms) for 4U beebeez!, coz if i remember correctly, i tried putting a low mark in for it and it came up with "Mark too low, using minimum mark of 75" or something

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