# Error analysis on linear regression

• Apr 15th 2010, 12:14 PM
DuckyLuck
Error analysis on linear regression
Hi everyone, I'm new to the forum.

Here's my problem:

I've carried out a linear regression on Excel, and have calculated (with Excel commands) the slope (a) the intercept (b) and their errors (delta a and delta b).

What I need to find is the error for y (as in y=ax+b).

Any idea how I can do this?
• Apr 15th 2010, 11:35 PM
CaptainBlack
Quote:

Originally Posted by DuckyLuck
Hi everyone, I'm new to the forum.

Here's my problem:

I've carried out a linear regression on Excel, and have calculated (with Excel commands) the slope (a) the intercept (b) and their errors (delta a and delta b).

What I need to find is the error for y (as in y=ax+b).

Any idea how I can do this?

You might want to check what $r^2$ (or is that $R^2$) signifies.

CB