A Simple and Practical Method of Calculating the Gini Coefficient

The Gini coefficient is a way to describe socio-economic phenomena by mathematical model. Using an improved approximation regression method to estimate Gini coefficient in the model parameters. The regression accuracy of non-linear mathematical model seeked by improved method was significantly improved when compared with which seeked by the original approximation regression method. The normal equation derived from improved method which remains its convenient using advantages was just weighted from the normal equation derived from the original method.