如何在MATLAB中绘制置信区间?

问题描述

我想在MATLAB中绘制一些置信区间图，但是我完全不知道如何做.我将数据保存在.xls文件中.

I want to plot some confidence interval graphs in MATLAB but I don't have any idea at all how to do it. I have the data in a .xls file.

有人可以给我提示吗，或者有人知道用于绘制CI的命令吗?

Can someone give me a hint, or does anyone know commands for plotting CIs?

推荐答案

我不确定置信区间图的含义，但这是如何绘制正态分布的两侧95％CI的示例:

I'm not sure what you meant by confidence intervals graph, but this is an example of how to plot a two-sided 95% CI of a normal distribution:

alpha = 0.05;          % significance level
mu = 10;               % mean
sigma = 2;             % std
cutoff1 = norminv(alpha, mu, sigma);
cutoff2 = norminv(1-alpha, mu, sigma);
x = [linspace(mu-4*sigma,cutoff1), ...
    linspace(cutoff1,cutoff2), ...
    linspace(cutoff2,mu+4*sigma)];
y = normpdf(x, mu, sigma);
plot(x,y)

xlo = [x(x<=cutoff1) cutoff1];
ylo = [y(x<=cutoff1) 0];
patch(xlo, ylo, 'b')

xhi = [cutoff2 x(x>=cutoff2)];
yhi = [0 y(x>=cutoff2)];
patch(xhi, yhi, 'b')

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