Register to reply

Calculating Error

by simpleton
Tags: error
Share this thread:
simpleton
#1
Dec30-10, 05:05 AM
P: 59
Hi all,

I am trying to use excel to do error analysis. I have a set of data points, and I have the average value and standard deviation of all the data points (which I use to plot the error bars). I want to use the excel to plot the best fit line and extreme line to get the error. However, it seems that excel does not allow me to draw extreme lines :(

Therefore, I was wondering if there is a way for me to calculate out the error, if I am given the standard deviation of all the datapoints and the equation of the best-fit line. The value I want is the gradient of the graph with its associated error.

Does anyone know how to draw extreme lines in excel? If not, can someone tell me how I can calculate the error of the gradient? Thanks!
Phys.Org News Partner Mathematics news on Phys.org
Researcher figures out how sharks manage to act like math geniuses
Math journal puts Rauzy fractcal image on the cover
Heat distributions help researchers to understand curved space
mrmiller1
#2
Dec30-10, 01:47 PM
P: 51
You have error bars so I'm guessing you know the error for each point. You can make a seperate column on excel, add or subtract the error from each point (new point = old point + 0.05... for example), and then add this data set to the graph. That should be your error curve.
simpleton
#3
Dec30-10, 10:54 PM
P: 59
Hi mrmiller1,

Thanks for your reply.

However, it seems that when I set error bars, the error bars for all the points will be the same. Is there a way for you to set different error bars for different points?

Also, do you know a way to physically draw in the error curve or extreme line?

Thanks in advance! On a sidenote, I am using excel 2007.


Register to reply

Related Discussions
Calculating percent error in a lab please help Introductory Physics Homework 1
Calculating error Calculus & Beyond Homework 3
Calculating average error Introductory Physics Homework 1
Calculating Error Analysis Introductory Physics Homework 0
Calculating the % error & maximum error Biology, Chemistry & Other Homework 1