Confidence Interval for Prediction in Weighted Regression

#1
Hi everyone,

I'm currently writing my final year project in analytical chemistry, and have got to the stage of calculating confidence intervals for weighted regression. Unfortunately, I have not been able to find and good resources to help me with this.

Basically, my problem is as follows.

I have done a weighted linear regression on my data, and I have calculated a value of x from my equation, however I don't know what formula to use to calculate my CI; I just know that it is different to the one used in unweighted regression.

If anyone could help me, or send me a link to an article describing this problem, I would be ever so grateful!

Thanks,

Erik