How to put errorbars
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Hi Everyone, How can i put errorbars in my figure below (Between red and green graphs)?
采纳的回答
Star Strider
2014-7-25
Use the errorbar function on the line of your choice. The easiest way to do this is to plot that line, then use hold to plot the others:
figure(1)
errorbar(Traffic, EngsetPb, barvector)
hold on
plot( ... the rest ... )
hold off
grid
Hypothetical variables here.
5 个评论
Star Strider
2014-7-25
Confidence intervals are probability estimates of the error at each point.
Aftab Ahmed Khan
2014-7-25
Star Strider
2014-7-25
What error bars do you want to plot? The Statistics Toolbox should give you the standard errors if you are using a regression function. The functions and methods you use to get those depend on the regression function you’re using. For nlinfit for instance, you would use nlpredci.
Otherwise calculating confidence intervals is more complicated, for instance if you have empirical data you are plotting as a mean and standard error at each point. Those are usually given with respect to a specific distribution. (My experience with the Erlang distribution is limited, so I can’t comment on it specifically.) The general rule is to use either the t-distribution or the normal distibution. For the normal distribution it is usually given as 1.96 times the standard error. The standard error is given by:
SE = std(data)/sqrt(N);
where N = length(data) for each point.
Aftab Ahmed Khan
2014-7-25
Awesome, Great. Done Cheers. This is what i get. Still some work left in it as the red graph should match the green graph for me.
Star Strider
2014-7-25
My pleasure!
更多回答（2 个）
Wayne King
2014-7-25
编辑：Wayne King
2014-7-25
Do you have the Statistics Toolbox?
x = 1:10;
y = sin(x);
e = std(y)*ones(size(x));
plot(x,y,'b')
hold on
errorbar(x,y,e,'bo','markerfacecolor',[0 0 1])
Not sure exactly what you mean by "between red and green graphs"
I'm assuming that each data point is an estimate and you have an associated confidence inteval that you want to represent
2 个评论
Aftab Ahmed Khan
2014-7-25
Wayne King
2014-7-25
Presumably this probability comes with some associated error, you just want to use that error in errorbar()
Abo Saqer
2017-8-15
0 个投票
Hello
Can I get this code to calculate BP, please
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