The improved background value of ameliorating GM (1, 1) model and its application

The background grey level is an important facto r affecting the precision of grey system models. To improve the precision of the grey model, the background value was rebuilt based on the monotonic rise of accumulated generating sequence. The sum of triangle area subtracted from narrow trapezium area is instead of the tradition background value. The rebuilt background value w as more close to the practical value, and the model accuracy was improved. Finally, the step of grey modeling was given, and the application result s showed that it is effective.