+ Reply to Thread
Results 1 to 3 of 3

Thread: Difference between RMS & Standard Deviation

  1. #1
    Points: 5,630, Level: 48
    Level completed: 40%, Points required for next Level: 120

    Posts
    8
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Difference between RMS & Standard Deviation




    Hi there,

    I am trying to figure out the difference between RMS and Standard Deviation. Are they two ways of saying the same thing? I understand that the variance is calculated with the following formula (excuse the notation!)

    s2 = Sum(xi-)2/N

    where
    is the population mean
    N is the population size.

    I then found the definition of RMS to be

    RMS (Root Mean Squared) Error. To calculate the RMS (root mean squared) error the individual errors are squared, added together, divided by the number of individual errors, and then square rooted. Gives a single number which summarizes the overall error.

    However, I though that (xi-) would be the error. Therefore, the variance is the individual errors squared and then added together, divided by the number of individual errors. Then the square root is the RMS, which would also be the standard deviation.

    Is this correct? Sorry for being a bit dumb!

    Thanks

    Tim

  2. #2
    TS Contributor
    Points: 17,636, Level: 84
    Level completed: 58%, Points required for next Level: 214
    JohnM's Avatar
    Posts
    1,948
    Thanks
    0
    Thanked 6 Times in 5 Posts
    From what I am able to gather, the term has different meanings in different contexts, but it's basically the same thing as a standard deviation.

  3. #3
    Points: 5,630, Level: 48
    Level completed: 40%, Points required for next Level: 120

    Posts
    8
    Thanks
    0
    Thanked 0 Times in 0 Posts

    That's what I thought.

    Thanks!

+ Reply to Thread

           




Similar Threads

  1. Replies: 8
    Last Post: 09-03-2014, 11:48 AM
  2. Replies: 5
    Last Post: 10-28-2010, 06:04 PM
  3. Replies: 1
    Last Post: 10-16-2010, 09:04 AM
  4. Standard deviation of the mean difference
    By John Smith in forum Statistics
    Replies: 1
    Last Post: 11-26-2008, 01:21 AM
  5. Finding standard deviation difference t-test?
    By excoder in forum Statistics
    Replies: 0
    Last Post: 06-07-2007, 03:15 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats