how is a lorenz curve calculated 
after collecting data from a relatively large sample size a lorenz curve is then fitted to best demonstrate the distribution of that data set because each set of information is different there is no single universal curve formula and the nonlinear regression will often look very different for different data sets the bottom linea common method of visually analyzing inequality distributions is to use a lorenz curve the curve graphically depicts what a standard distribution of equality would look like then the graph layers on the actual distribution of a given data set the lorenz curve is used to calculate the gini coefficient to mathematically analyze how unequal a dataset is and it is used to visually exam inequality levels as well 