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

Quick pdf question

  1. May 3, 2014 #1

    joshmccraney

    User Avatar
    Gold Member

    hey all (again)!

    how do people create pdf's? it seems like we start by collecting info and turning it into a histogram. then do we simply look at an array of curves, or is there something more, such as what is done of finding the least squares method for fitting data to a line?

    thanks!
     
  2. jcsd
  3. May 3, 2014 #2

    FactChecker

    User Avatar
    Science Advisor
    Gold Member

    Most of the time the data is assumed to fit some known distribution with a theoretical PDF and parameters. Then the parameters are estimated. If you are creating a PDF from scratch from the data, I would make a CDF first. The CDF is an integral of the PDF so it is smoother and less dependent on the choice of histogram partitions. Then a curve can be fit to the CDF and the PDF can be estimated.
     
  4. May 5, 2014 #3

    joshmccraney

    User Avatar
    Gold Member

    Thanks!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Quick pdf question
  1. Joint pdf question (Replies: 2)

  2. A pdf question (Replies: 4)

Loading...