Beefy Boxes and Bandwidth Generously Provided by pair Networks Frank
Think about Loose Coupling
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
$NORM measures the average reputation of recent nodes. It answers the question, "Are nodes rated high or low?"

Entropy measures the information content of node reputation. It answers the questions, "How much does the node's reputation tell us? How meaningful is the assignment of reputation?"

Say $NORM is 11. Well, this can happen if all recent nodes have reputation 11. If this is the case, the entropy is 0 because knowing that a node has reputation 11 tells us nothing about the node.

On the other hand, maybe among all recent nodes, an equal number of them have reputation 1, 2, 3, .. up to 22. This situation also gives us $NORM = 11. But here, knowing the reputation of a node gives us much more information. Reputation in itself is more meaningful in this scenario because it can tell us something. The something it is telling us is information in the theoretical sense.

$NORM tells us whether nodes are given high or low reputations on average (although the variance might be useful to know as well). It is an analysis of the values of a random variable. Entropy is completely orthogonal; independent of how high or low the nodes are ranked, it tells us how informative node reputation really is. It is an analysis of the uncertainty of a random variable. You can have any combination of low or high average with low or high entropy.

blokhead


In reply to Re^3: (contest) Help analyze PM reputation statistics by blokhead
in thread (contest) Help analyze PM reputation statistics by demerphq

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!
  • 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, 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, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            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.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others having an uproarious good time at the Monastery: (5)
    As of 2014-04-20 12:39 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      April first is:







      Results (485 votes), past polls