Low-pass filter added

Greg Goodman suggested that I should add a better low-pass filter than the ordinary moving average.

Different digital low-pass filters are described on wiki here

I chose a so called Blackman filter, which seems to behave very well. The better performance of a good designed low-pass compared with moving average is evident in this plot of RSS data:

Lowpass filter
Low-pass filter versus moving average applied on RSS series, both filters use a 60 month interval.

We see here that the moving average, in red, has tops just before 1990, in 2000 and around 2008. The raw data has low values in the same places.

These tops are all artefacts due to the effects of high values on each end of the averaging interval.

The low-pass filter, in blue, gives a more real representation of the raw data.


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Welcome to Csens.org blog. This site is meant for discussions of the statistics presented on csens.org. My intention with csens.org is to present some of the facts about how the world is developing as easily accessible and understandable graphs.

The main focus is on energy, climate and environment related topics on a multi-decadal time scale.

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Some trends and directions are easier to spot when you take the long perspective.



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