Grandfather,

Your use of sd seems to indicate you are thinking of Standard Deviation for your boundaries.

Know then that a Standard Deviation is not a hard boundary and that is perfectly OK for an individual value to be outside the mean + or - the Standard Deviation.

Chebyshev stated that at least 50% of the values in your set will be within 1.4 standard deviations from the mean. As a corrolary, this means that upto 50% of your values may be more than 1.4 times the Standard Deviation away from your mean. It probably also means that you cannot have a flat distribution for your data if you have to simulate a certain Standard Deviation.

But then again perhaps you did not think of Standard Deviation at all when asking this question!

CountZero

"If you have four groups working on a compiler, you'll get a 4-pass compiler." - Conway's Law

In reply to Re: Need technique for generating constrained random data sets by CountZero
in thread Need technique for generating constrained random data sets by GrandFather

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.