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Jon Peltier

These "tree-ring" charts are terrible. I ranted about this form in How to Make a Donut-Pie Combination Chart.

The red outer "ring" with its extension in the lower right reminds me of nothing more than a roll of toilet paper. Probably not the intended message, unless it's to say "Our earnings are in the crapper".


when the growth is slow, the rings are close together, and labels have to be jittered (look at 2001 and 2002)

I was going to complain that there was no need to jitter, just don't label every year. Then I realised that growth had not been uniformly positive, and so every year must be labelled. Which just says to me that only uniformly increasing series are even slightly appropriate for this "tree-ring" format. Sometimes-shrinking series should never be displayed like this.

Andrew Conkling

I said the same thing about the tree ring chart; I guess I'm paying attention. ;)

Jim Lemon

The "tree-ring" chart, like the much maligned pie chart, depends upon a material analogy for its interpretation. Those who know that the width of tree rings provide an indication of the climatic conditions for those seasons of growth will unerringly interpret such charts correctly. This is not a smarty-pants justification for the "tree-ring" chart (I'm no dendroclimatologist), but an observation that the analogy must be widely known for such illustrations to succeed.

tungsten carbide rings

The chart shows us on what happen during year a year,but you can also noticed the high impact on the year 1999 its so high than the other year.Thank you for this chart ring its very informative.

by: alpha

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