Study linear regression with this tool. Linear Regression for Chemical Analysis help you calculate the regression parameters and the limit of detection for two linear scenarios. The user enters the calibration values into the table at the left and immediately sees the results.
Linear regression is a commonly used method to establish a quantitative relationship between two variables (for example, the absorbance at a specific wavelength and the concentration of a particular compound). In the case of chemical analysis there is a special condition, which prohibts, for example, negative concentrations of a given substance.
Knowing this fact one can determine the detection limit. The detection limit, or LOD (limit of detection), is the lowest quantity of a substance that can be distinguished from the absence of that substance (a blank value) within a stated confidence limit (generally 1%).

The license of this software is Freeware, you can free download and free use this calculator software.