| T O P I C R E V I E W |
| jule2013 |
Posted - 03/24/2013 : 06:07:30 AM
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System: Origin 7.0 (with Add-on for ITC)
Dear users,
I already searched this forum, but could not find the answer: I have done ITC measurements on a VP-ITC (GE healthcare) and the software supplied is an add-on for Origin 7.0 . I have tried to fit the data points to different models offered, like "binding on one site" or "sequential binding with x sites". Unfortunately the only measurement to judge the qualitity of fit that is offered is the chisqr/ dof . I always get things like 4E4 for the fit, but I have no clue if that is good or bad. When I checked the manual I found an example where they estimated a chisqr/ dof for the fit of 30000, so I guess it would be ok if I get 4E4? IT would be very kind if someone could explain this to me (also I'm not very good with statistics as it is quite some years ago that I had a class)?
Thanks! |
| 4 L A T E S T R E P L I E S (Newest First) |
| jule2013 |
Posted - 03/26/2013 : 05:46:35 AM
The links really helped :)
Thanks a lot! |
| matthew@originlab.com |
Posted - 03/25/2013 : 12:50:00 PM
Hi,
A Reduced Chi Sqr value will ideally be close to 1. However, it can be scaled significantly with a scaling of y-data, so other measures such as R Sqr and Adjusted R Sqr can sometimes give a better indication of goodness of fit. See the following links for more information:
http://qhwiki.originlab.com/~originla/howto/index.php?title=QuickHelp:How_do_I_know_if_my_fit_result_is_good
http://qhwiki.originlab.com/~originla/howto/index.php?title=QuickHelp:Why_is_my_Reduced_Chi-Sqr_value_very_different_from_1
Matthew
OriginLab |
| jule2013 |
Posted - 03/25/2013 : 10:00:45 AM
Dear Matthew,
thanks for the quick reply, but the thread didn't help. I still don't know if a reduced chi sqr. in the order of 4E4 is good or bad?
Regards,
Jule |
| matthew@originlab.com |
Posted - 03/25/2013 : 09:24:48 AM
Hi,
Chi Sqr / DoF is also known as Reduced Chi Sqr. See if this thread answers your question: http://www.originlab.com/forum/topic.asp?TOPIC_ID=6819
Matthew
OriginLab |
