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

Linear function errors

  1. Mar 10, 2007 #1
    Hi,

    When I'm doing an experiment,

    If the result of the experiment was some points, which I interpolate to create the linear function:

    y=(a/b^2) x+c

    while y is a function of x: y=f(x)

    If the standard error in y was (S), How can I calculate the error in b?

    Thank you
     
  2. jcsd
  3. Mar 10, 2007 #2

    malawi_glenn

    User Avatar
    Science Advisor
    Homework Helper

    Are you using "least square fit" ?
     
  4. Mar 12, 2007 #3
    No, I'm using the statistical way, you can see its law in the image i've attached,

    (((n_points is the quantity of the used points, y_i is the y-coordinate of the point i due to experiment, f(x_i) is the y-coordinate of the point i due to the interpolated function, n_param is the repeat of every point which equals always one as I think in my experiment because every point is measured once)))

    I'm using program named "curve expert 1.3" to interpolate the linear function, you can download it for free and check the errors details, i was not able to upload the detailed help file because it's big

    Is this information enough?
     

    Attached Files:

    Last edited: Mar 12, 2007
  5. Mar 12, 2007 #4

    malawi_glenn

    User Avatar
    Science Advisor
    Homework Helper

    Well these programs are very often doing least square fit.. but the calculate it very fast hehe.

    Least square fit is a statistical method.

    Scince you are using a program that i dont use, i cant help you. sorry.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Linear function errors
  1. Error function (Replies: 5)

Loading...