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matrix, ludcmp.awk. This is providing correct answers on _some_ test data,
further testing debugging required here.
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added ($x ~ number) check to lin_reg;
added gaussian expressions gaussian;
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added 'nan' output to diff;
added ':' output delimiter to lin_reg and quad_reg;
fixed broken r^2 calc in quad_reg;
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y intercepts, y(mean(x)), weighted y(weighted_mean(x)), distance of weighted
mean solution from the mean
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[weighted_mean(x), y(weighted_mean(x))]
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added pwr(x,p) function to sterling_approx;
minor clean up all around;
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quad_reg output
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diff, diff1, lin_reg, lin_reg1, and lin_reg2;
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lin_reg
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and variance calc to mean.awk
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