在java开发的过程中，一些数据统计或者报表用到的图表，比如：饼图，条形图等-In java development process, some of the statistics used in the report or chart, such as: pie charts, bar charts, etc.

数据降维工具，包括统计方法和流形学习方法-Data reduction tools, including statistical methods, and manifold learning method

趋势面分析是拟合数学曲面的一种统计方法,通常要找到一个合适的曲面(Trend surface analysis is a statistical method of mathematical curved surface fitting, usually want to find a suitable surface)