The following script will call a simple running mean three times with appropriate window size to do effect triple running mean, as described in the article (as amended for the asymmetric kernel to minimise negative leakage):
https://climategrog.wordpress.com/2013/05/19/triple-running-mean-filters/
It requires the runmean.awk script found here:
https://climategrog.wordpress.com/2013/11/02/574/
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#!/bin/bash
# call runmean.awk three times to compose triple running mean
# usage: ./r3m.sh file window_len ; default window is 12 data point
if [ "x$1" == "x" ]; then echo "$0 : err no file name, usage: $0 filename "
exit 1;
else fn=$1
fi
if [ "x$2" == "x" ]; then win=12; else win=$2; fi
#win2=`awk "BEGIN{print $win/ 1.3371}"`
#win3=`awk "BEGIN{print $win/ 1.3371/ 1.3371}"`
# asymmetric stages with following window ratios:
k=1.15; k2=1.58
win2=`awk "BEGIN{print $win/ "$k"}"`
win3=`awk "BEGIN{print $win/ "$k2" }"`
outfile=`echo $fn | awk '{ print substr($1,1,length($1)-4) }'`
outfile+="-3rm"$win".dat"
echo "# triple running mean : $win $win2 $win3 " > $outfile
# echo $fn; echo $win; echo $win2; echo $win3
cat $fn | ./runmean.awk - $win | ./runmean.awk - $win2 | ./runmean.awk - $win3 >> $outfile
#echo "# cat $fn | ./runmean.awk - $win | ./runmean.awk - $win2 | ./runmean.awk - $win3 >> $outfile"
echo "# triple running mean : $win $win2 $win3 "
echo "# outfile = "$outfile;
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