Just one sec...
Hey there! Sign in to join this conversationNew here? Join for free to post

+/- sign.

Announcements Posted on
Take our short survey, £100 of Amazon vouchers to be won! 23-09-2016
    • Thread Starter
    Offline

    3
    ReputationRep:
    I've never had to deal with this sign before, what exactly does it mean?


    Cohen (1988) provides criteria for assessing the strength of r (also known as effect size): Small: r +/- 0.1 Medium: r +/- 0.3 Large: r +/- 0.5What does the +/- mean in this context?
    Offline

    3
    ReputationRep:
    It's called the plus or minus sign.

    The correlation coefficient can also be used when the data are binary. R can vary in magnitude from −1 to 1, with −1 indicating a perfect negative linear relation, 1 indicating a perfect positive linear relation, and 0 indicating no linear relation between two variables.
    Offline

    3
    ReputationRep:
    (Original post by natalie427)
    I've never had to deal with this sign before, what exactly does it mean?


    Cohen (1988) provides criteria for assessing the strength of r (also known as effect size): Small: r +/- 0.1 Medium: r +/- 0.3 Large: r +/- 0.5What does the +/- mean in this context?
    Depends on the context. In Mathematics a \pm sign gives strictly 2 different values, however in other applications it can give a range of values.

    For example 3\pm 0.5 can provide a range between 2.5 and 3.5, or give you only strict values of 2.5 and 3.5.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Kvothe the Arcane)
    It's called the plus or minus sign.

    The correlation coefficient can also be used when the data are binary. R can vary in magnitude from −1 to 1, with −1 indicating a perfect negative linear relation, 1 indicating a perfect positive linear relation, and 0 indicating no linear relation between two variables.
    I understand all that a but this is referring to the strength of the correlation, I just can't work out what that sign suggests.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by RDKGames)
    Depends on the context. In Mathematics a \pm sign gives strictly 2 different values, however in other applications it can give a range of values.

    For example 3\pm 0.5 can provide a range between 2.5 and 3.5, or give you only strict values of 2.5 and 3.5.
    Actually Ive just worked it out

    Small = +/1 0.1


    Medium = +/- 0.3

    Large = +/- 0.5


    So for example, 0.01 would be small
    0.2 would be a small/medium
    0.3 would be medium
    0.4 would be medium/large
    0.5 would be large
    Offline

    3
    ReputationRep:
    (Original post by natalie427)
    Actually Ive just worked it out

    Small = +/1 0.1


    Medium = +/- 0.3

    Large = +/- 0.5


    So for example, 0.01 would be small
    0.2 would be a small/medium
    0.3 would be medium
    0.4 would be medium/large
    0.5 would be large
    Yes in your context it can mean that whatever value you take, like 0.3, then the affect size will be medium regardless whether it is negative or positive.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by RDKGames)
    Yes in your context it can mean that whatever value you take, like 0.3, then the affect size will be medium regardless whether it is negative or positive.

    Yes the effect sizes of the correlation is independent to whether the correlation is positive or negative.

    I just was unsure of the sign, the correlation and effect size I'm aware of .
 
 
 
Write a reply…

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: September 22, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Poll
Who will be the next permanent England boss?
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.