Any math/science buffs around?

Discussion in 'The Guru's Pub' started by dune2, Jul 14, 2005.

  1. dune2

    dune2 Ancient Guru

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    I have a small question,

    when I want to show mathematically that independent variable Y is negatively related to X, how do I show this? Is there is certain sign I can use?
    The sentence is: Y decreases if X is increased. Anybody good at statistics??

    Cheers for any help!
     
  2. smnoamls

    smnoamls Maha Guru

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    how about Y= 1 / x ?
    or Y = - X?
     
  3. dune2

    dune2 Ancient Guru

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    I guess mathematically, the first one is actually correct. But I was hoping more for a statistical way of writing down a correlation. Thanks anyway!
     
  4. Mohsin Ali

    Mohsin Ali Member Guru

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    The correct equation is [ y = - x ].

    You can easily imagine it graphically, for every increasing value of x, y decreases, and a simple straightline graph is formed. If you keep the slope to 1 then you get [ y= - x] but still you can switch between slopes and starting point , in this equation the line passes through origin because there isn't horizontal shift present in the equation.

    [edit], here is the graph
    [​IMG]
     
    Last edited: Jul 14, 2005

  5. Vinnie

    Vinnie Ancient Guru

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    Havnt got that on school yet... I think :p
     
  6. fa7al

    fa7al Active Member

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    There is a greek sign for proportional to, its kind of like a lower cased alpha except with a tail on the top on the right. In other words, an infinite sign with the circle on the right half cut off.

    So to write it you would just write y (proportional sign thingy) -x
     
  7. Shadowsoldier

    Shadowsoldier Ancient Guru

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    I love math


    Its fun to be a nerd
     
  8. dune2

    dune2 Ancient Guru

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    @fa7al: Any chance you have a pic of that sign?
     
  9. PcKSnipE

    PcKSnipE Master Guru

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    Note sure about the latter
     
  10. drwngflies

    drwngflies Maha Guru

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  11. FreeFall

    FreeFall Master Guru

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    Thanks for the link drwngflies.
     
  12. drwngflies

    drwngflies Maha Guru

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    Wish I would've stayed in class more and learnt these things... %)
     
  13. reflex

    reflex Ancient Guru

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    i havnt got to this kinda math in school yet :confused:
     
  14. Dojomann

    Dojomann Ancient Guru

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    Wow, what grade are you in? I started fully using variables in grade 9.
     
  15. Brettbeck

    Brettbeck Maha Guru

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    I haven't got that deep into graphs yet eighter lol. I think we should have tho as im in year 9.
     

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