reldist包里面有基尼系数的函数，gini()——
gini(x, weights=rep(1,length=length(x)))
核密度估计就是density()啦，在stats包里面
density(x, bw = "nrd0", adjust = 1,
kernel = c("gaussian", "epanechnikov", "rectangular",
"triangular", "biweight",
"cosine", "optcosine"),
weights = NULL, window = kernel, width,
give.Rkern = FALSE,
n = 512, from, to, cut = 3, na.rm = FALSE, ...)
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