Comments on: A Pretty Graphic of ARMA Coefficients http://climateaudit.org/2005/08/14/a-pretty-graphic-of-arma-coefficients/ by Steve McIntyre Sat, 25 May 2013 05:25:12 +0000 hourly 1 http://wordpress.com/ By: Mike B http://climateaudit.org/2005/08/14/a-pretty-graphic-of-arma-coefficients/#comment-35719 Fri, 21 Sep 2007 19:45:14 +0000 http://www.climateaudit.org/?p=308#comment-35719 Thanks for bumping these Steve. Goes to show how much I missed on this site before I first visited.

]]> By: Jean S http://climateaudit.org/2005/08/14/a-pretty-graphic-of-arma-coefficients/#comment-35718 Fri, 21 Sep 2007 18:11:10 +0000 http://www.climateaudit.org/?p=308#comment-35718 Nice! This is from times before even I used to visit this site ;=) Think about it, only two real comments in a post!

How about an update: the same plot but with detrended series? :)

]]> By: Steve McIntyre http://climateaudit.org/2005/08/14/a-pretty-graphic-of-arma-coefficients/#comment-35717 Fri, 21 Sep 2007 17:53:29 +0000 http://www.climateaudit.org/?p=308#comment-35717 bump

]]> By: Wolfgang Flamme http://climateaudit.org/2005/08/14/a-pretty-graphic-of-arma-coefficients/#comment-35716 Sun, 16 Oct 2005 23:58:51 +0000 http://www.climateaudit.org/?p=308#comment-35716 Steve,

sorry for the late reply.
As far as I understand (KISS since I am no expert), the first AR1-coefficient tells us how good the system can remember its previous state whereas the second MA1-coefficient tells us how good random influences will remember (or compensate for) their previous influence. Is that basically correct?

Given that I don’t get the point looking at the varying MA1-coefficients in the polar regions, especially the antarctic region. Altough gridcell aereas are much smaller there, some show a tendency to compensate for previous influences while their gridcell neighbours behave just the opposite. Any idea wether that’s due to sparse data or zoom-in effects?

Very interesting indeed – keep up the good work.

]]> By: Steve McIntyre http://climateaudit.org/2005/08/14/a-pretty-graphic-of-arma-coefficients/#comment-35715 Sun, 14 Aug 2005 19:12:21 +0000 http://www.climateaudit.org/?p=308#comment-35715 Armand, try http://www.climateaudit.org/wp-content/arma.coefficients.eps

]]> By: Steve McIntyre http://climateaudit.org/2005/08/14/a-pretty-graphic-of-arma-coefficients/#comment-35714 Sun, 14 Aug 2005 19:08:42 +0000 http://www.climateaudit.org/?p=308#comment-35714 HEre’s a script to produce this graphic (it requires prior calculation of coefficients). It’s crazy how simple it is to produce fancy stuff with modern methods.

##SCRIPT TO PRODUCE PRETTY GRAPHIC OF ARMA COEFFICIENTS
library(fields)
load(“c:/climate/data/jones/arma.coefficients.tab”)

# postscript(file.path(“c:/climate/data/jones/arma.coefficients.eps”), width = 8, height = 6,
# horizontal = FALSE, onefile = TRUE, paper = “special”,
# family = “Helvetica”,bg=”white”,pointsize=8)
# this is used to create larger image

nf

]]> By: Armand MacMurray http://climateaudit.org/2005/08/14/a-pretty-graphic-of-arma-coefficients/#comment-35713 Sun, 14 Aug 2005 16:53:06 +0000 http://www.climateaudit.org/?p=308#comment-35713 Very nice images (and neat idea!). Might I suggest making these and similar plots 2x as wide and tall, pixel-wise, to make it easier to spot the fine details?

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