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我有散点图的数据(x
和y
值)。我想计算加权平均值和标准差作为X的函数。对于我的每一个点,我都希望计算每个值与预测值之间的标准偏差数。我目前使用msir
包中的loess.sd
函数,因为它会为我计算sd。有谁知道我怎么能得到每个数据点的预测SD?或者可能有其他更好的方法来解决这个计算问题?提前致谢。用黄土预测值和标准差
我当前的代码:
#... scatter plot of data
plot(xy,ylim=c(0,50),pch=20)
#loess +- 1 sd
std_loess = loess.sd(xy, nsigma =1,span=0.3)
# ... add weighted average to plot
lines(std_loess$x,std_loess$y,col="firebrick2")
# .... add weighted sd to plot
lines(std_loess$x,std_loess$y,col="firebrick2")
#.... get observed data points
lines(std_loess$x,std_loess$upper,col="dodgerblue2")
# ... get expected value for each data point
obs = xy[,2]
# ... get predicted sd for each data point
expected = predict(std_loess$model,data.frame(xy))
# ...get predicted sd for each data point
exp_sd = ??????????????????
# ...get predicted sd for each data point
sd_away = (obs - expected)/exp_sd