Unweighted least squares regression analysis

The weighted least-squares routine shown below provides the adjustable parameters and their standard deviations. If that is all you need, you may want to use it also as your general least-squares routine, especially after you have incorporated it in a menu or given it a toolbar icon (in which case it is easier to use and more readily accessible than the Regression routine in the Analysis ToolPak). When using it for unweighted least squares, merely leave the second column empty. Alternatively, if you desire the routine to provide more statistical information, you can modify it to do so. Remember, you are at the controls here. 

CH O )] - ion records of the compound of interest versus this of its H labeled analog. Ratios for the standard mixtures were plotted against the concentrations in ng mT, and an unweighted least squares linear regression analysis was performed. Using the regression parameters of the calibration curve,the... 

Quantitative analysis, A series of 5 aqueous standards, covering the concentration range of interest (10-100 ng ml was used to construct a calibration curve. A typical curve is shown in fig.4 in order to demonstrate the linearity and the precision. The curves were obtained by unweighted least squares linear regression based on previous research, which indicated that this type of statistical analysis can be employed with stable isotope labeled internal standards and for a 10-fold range of x-values because the errors associated with the y-values are approximately constant (16). Using the regression line(fig.4) in reverse, a standard error of 1. 2 ng ml could be... 

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