| T O P I C R E V I E W |
| surrounded |
Posted - 08/18/2003 : 4:25:36 PM
Hi
I want to merge several datasets in a scatter plots, and I currently use Analysis:Average Multiple Curves which works fine, except that it doesn't give the standard deviation for the means. Does anybody know how to do this?
Here is what I'm trying to do, in case there is a simpler way to do it (it is pretty common task, I'm sure, but I can't find it):
I got 3 trials of a titration, so my y is pH and x volume of titrant. I want to have 1 curve, with y bars showing the difference between the 3 trials. The problem is that not all x's are the same (same range, but not identical: aliquots of 0.5mL where added, and the pH was read, but the alliquotes where not exactly constant: eg 0.51mL, 0.50mL and 0.49mL )
Thanks in advance, Dimitris |
| 1 L A T E S T R E P L I E S (Newest First) |
| easwar |
Posted - 08/18/2003 : 9:41:05 PM
Hi Dimitris,
There is a built-in Assays worksheet template in Origin that can be used for this:
1> Use the menu command File->New, and in the dialog that comes up, pick Worksheet. Then click the browse (...) button next to Path, and navigate to the Buttons folder and click OK. Then pick ASSAYS in the Name drop-down list. This will open the Assays wks template.
2> In the Format group, click the XYXY radio, and set Replicates to 3. Then click the Display button. This will change the worksheet to X1,y1,x2,y2,x3,y3.
3> Enter your data in those columns, and then click Average button, with the Data Range selection set to Entire Worksheet. This will pop up a result worksheet that has the mean and std. dev. The result worksheet also has Find New X/Y buttons that use a fitting model to perform the computation.
You can also set up your custom function/command to do the above, by writing a LabTalk script program, or by using Origin C. Post here if you need programming help.
Easwar
OriginLab.
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