Quote:
Originally Posted by Tropo-Bob
Secondly, BOM reports say the last decade was the hotest decade and this is consistent with the reports of other weather agencies.
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Thanks for your comments.
Sometimes the derived 'trend line' on a graph depends on how the data points are analyzed. There is more than one way to draw a trend line on a graph, as we all found out when we did science experiments at school and university and we graphed data points of the measured quantities "all over the place" instead of along the particular mathematical function (curve or line) that we had hoped for.
Numerous tools of statistics and error-analysis have been developed to try to extract meaningful trends from the mass of messy data, and to estimate the error budget of each measurement that scientists make, but when there is only a slight trend on a graph, it is easy enough to draw two different trend lines, one in each direction (increasing and decreasing) through the data points.