Recent content by dipluso

  1. D

    Converting Error in Log2 Form for Arbitrary Base

    Duh, figured it out. For y=ln(x), error dy=dx/x since lob(x) base b = ln(x)/ln(b) Then for y=lob(x) base b , error is dy=(1/ln(2))(deltax/x) Done. Cheers, -Alex
  2. D

    Converting Error in Log2 Form for Arbitrary Base

    Hi, I am trying to represent my data in log2 form rather than "fold change" and I am embarrassed to say I can't remember how convert the error. For example, I have x=3.96 (mean), deltax=0.28 (standard dev). Thus, log2(x)=0.598. But how do I convert the error?? I know how to do it for...
  3. D

    Is My Error Propagation Formula Correct? - Help Needed

    Thanks to you both. I have to say that you both give very reasonable answers - and indeed they report similar errors. I don't know why the value reported by the machine's software is different (mine was just plain wrong). Indeed it may be that it takes so other invisible factor into account...
  4. D

    Is My Error Propagation Formula Correct? - Help Needed

    Hi, I've been trying to reproduce the output of an analytical machine here at work by doing the calculation myself in Excel but I can't get the error to match. Perhaps I am propagating the error incorrectly... The calculation is z = 2^(x-y) The values are: x = 24.96 y = 25.98 and...
Back
Top