How to put errorbars

Hi Everyone, How can i put errorbars in my figure below (Between red and green graphs)?

Answer 1

[Star Strider]

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.

[Star Strider]

Confidence intervals are probability estimates of the error at each point.

[Aftab Ahmed Khan]

What is this barvector, i mean how can i calculate it?

[Star Strider]

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]

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]

My pleasure!

Answer 2

[Wayne King]

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

[Aftab Ahmed Khan]

Thank you for the reply. The red graph is my calculated blocking probability and i want to show the errorbar on this graph. What is mean by confidence interval? Sorry, if it is a very basic question as i am not as good when it comes to statistic.

[Wayne King]

Presumably this probability comes with some associated error, you just want to use that error in errorbar()

Answer 3

[Abo Saqer]

Hello

Can I get this code to calculate BP, please