Changes between Version 16 and Version 17 of RRDtool13


Ignore:
Timestamp:
Jun 15, 2007, 10:04:38 AM (15 years ago)
Author:
oetiker
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • RRDtool13

    v16 v17  
    55|| 2007-06-14 || Performance impact of MMAP IO and madvise quantified. ||
    66||            || Added TEXTALIGN command                               ||
     7|| 2007-06-15 || Multiplicative Holt-Winters Forecasting added         ||
    78
    89
    910== Completed ==
     11=== Multiplicative Holt-Winters Forecasting ===
     12
     13Evan Miller of IMVU added support for multiplicative Holt-Winters:
     14
     15There are two popular variants of the Holt-Winters forecasting method; RRDtool
     16supports the "additive" method, which means that seasonal variation is simply
     17added to the baseline. For our application, it would be more appropriate to use
     18the "multiplicative" Holt-Winters method, where seasonal variation is a
     19coefficient multiplied by the baseline.  Quick example to illustrate the
     20difference: if the average doubles season-over-season, the additive method
     21would predict the delta between min and max to be constant, whereas the
     22multiplicative method would predict the delta to double as well.
     23
    1024
    1125=== MMAP IO ===

NOTE: The content of this website is accessible with any browser. The graphical design though relies completely on CSS2 styles. If you see this text, this means that your browser does not support CSS2. Consider upgrading to a standard conformant browser like Mozilla Firefox or Opera but also Apple's Safari or KDE's Konqueror for example. It may also be that you are looking at a mirror page which did not copy the CSS for this page. Or if some pictu res are missing, then the mirror may not have picked up the contents of the inc directory.