| T O P I C R E V I E W |
| aiva18 |
Posted - 02/09/2009 : 3:29:31 PM
Origin Ver.8 and Service Release (Select Help-->About Origin):
Operating System: WIndows Xp
Hi,
I have a question regarding statistics on colums.
The distribution is known that is a log normal distribution. However, the columns consist of bins, and some bins are missing. i will insert the image to illiustrate it. Origin sometimes ignores the bins that are higher and only does the fitting through the peak. The fit in black line is done in excel using macro and red line Origin fit. How this fitting in Origin is actually done ? |
| 6 L A T E S T R E P L I E S (Newest First) |
| easwar |
Posted - 10/16/2009 : 10:19:52 AM
quote:
Originally posted by aiva18
Would you know how in Origin 8 version, is possible to sort the data into different size bins, in order to plot histogram. I used to sort all data in the same size bins. Using Frequency count in Statistics Menu bar, program allows to choose Computational control (Min and Max) and Increment (bin size). Now i require lets say, from 2 till 40 sort into 2 size bins, and after 40 sort into 5 size bins. How can I do that ?
Hello,
This feature of custom binning is being added to the upcoming version 8.1
It will be accessible from script, where user can specify a column that contains the custom bin end values to be used for the binning.
Easwar
OriginLab |
| aiva18 |
Posted - 10/15/2009 : 5:21:11 PM
Hi,
I have a question about log normal fit parameters. In a graph, A is an amplitude, but y axis is in percent. After fit A=166. What does this number is calculated and what it means ?
Thank you,
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| aiva18 |
Posted - 03/01/2009 : 12:21:25 PM
Would you know how in Origin 8 version, is possible to sort the data into different size bins, in order to plot histogram. I used to sort all data in the same size bins. Using Frequency count in Statistics Menu bar, program allows to choose Computational control (Min and Max) and Increment (bin size). Now i require lets say, from 2 till 40 sort into 2 size bins, and after 40 sort into 5 size bins. How can I do that ?
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| Deanna |
Posted - 02/25/2009 : 04:52:32 AM
Yes, this is indeed a weighting issue. When Direct Weighting is used, Origin can generate a fitted curve very closed to Excel's. If you are interested in the weighting methods available in Origin 8's non-linear curve fitting tool, please read:
http://www.originlab.com/www/helponline/Origin8/en/regression_and_curve_fitting/fitting_with_errors_and_weighting.htm
Deanna
OriginLab Technical Services |
| aiva18 |
Posted - 02/23/2009 : 5:09:51 PM
Hi,
I dont have the excel macro. I have email the data to info@originlab.com, because I had difficulty in uploading the data file to your website.
I hope you can try fitting the curve into this data. y has to be equal 0.
Sincerely,
Daiva |
| Deanna |
Posted - 02/10/2009 : 04:47:49 AM
Hi,
I am not sure how the Excel macro work. But it looks like that you want to use weighted fitting because you have error bars on the columns and the fitted result of Excel seems to include weights. But this is only my guess. Please send me your data including the Excel result and probably the excel macro so that I can verify my guess. For sending files, please follow the below instructions:
http://www.originlab.com/index.aspx?s=1&lm=123&pid=752
As for how Origin performs curve fitting, you can see here:
http://www.originlab.com/www/helponline/Origin8/en/origin.htm#regression_and_curve_fitting/interpreting_regression_results.htm
Deanna
OriginLab Technical Services |
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