Error Calculation in Large Set of Data

[Master J]

I perform a set of measurements x. This is performed for different values of y, ie. each value of y has a set of x values. Each measurement has an error associated with it.

There is also the value Dx, which is the difference in 2 x values. This has an error of twice the error of x.

I then need to plot the average value of x.Dx for each y value, against that y value.

My question is, how do I work out the error in this x.Dx that is to be plotted??

 

[EnumaElish]

Why do you need errors to plot the average xDx? Did you mean "plot the error of xDx"?

 

[Master J]

Sorry, perhaps its confusing. I am plotting that average, but the errors would be for the error bars!

 

[EnumaElish]

Can you post part of your data (or an example that looks like your data), and how you are constructing x.Dx?