Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Properties of variance

  1. Dec 13, 2007 #1
    [SOLVED] Properties of variance

    Would the Var(aX + bY + c) just be the Var(aX+bY) since adding a single number to the function doesn't change the variance. I would then be able to use the property:

    Var(aX+bY)= a^2Var(X)+b^2Var(Y)+2abCov(X,Y)

    Just wondering if anyone can confirm my reasoning here. Thanks.
  2. jcsd
  3. Dec 13, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper

  4. Dec 13, 2007 #3
    Thank you, that's all I need. Mods can close.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Properties of variance
  1. Variance of variance (Replies: 4)

  2. Adding Variance (Replies: 3)

  3. Variances of samples (Replies: 7)

  4. Variance of estimator (Replies: 2)

  5. Variance and kurtosis (Replies: 2)