Sentences with phrase «fit normal curves»

VAM - based scores can be easily constructed and manufactured by those charged with constructing such figures and graphs, also because tests themselves are also constructed to fit normal curves; hence, it is actually quite easy to distribute such scores around a bell curve, even if the data do not look nearly as clean from the beginning (they never do) and even if these figures do not reflect reality.

People are usually not surprised that oil production fits normal curves well, because for oil, production mirrors discovery, which has a random component to it.

Not exact matches

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Also when you do a least squares curve fit using the normal equations (the usual method), there is an implicit weighting of the data points proportional to their distance from the center.

On the same graph, I have a shown a normal curve, fit to the data.

Cumulative US crude - oil production from 1859, plotted from 1900 on, together with a normal curve that is the least mean square fit (ultimate 225Gb, 10 % year 1939, 90 % year 2011).

It turns out that we can give answers to all of these questions, using the same Hubbert linearizations and normal curve fits that we use for oil.

It does, however, suggest that even if all trees have negative exponential ring width curves, fitting a negative exponential to a sample that has relatively more old trees covering relatively recent years will tend to make the recent residuals look above normal, anomalously so.