2维度聚类标准误的计算代码，可用于多类回归模型-2 dimensional clustering standard errors of computing code, can be used for many types of regression models

二维高斯核函数重构 重构方法不依赖于参数化模型-2D Gaussian Kernel Reconstruction fast and accurate state-of-the-art bivariate kernel density estimator with diagonal bandwidth matrix. The kernel is assumed to be Gaussian. The two bandwidth parameter