Recent content by tappy
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Undergrad Calculating D-Spacings in a Monoclinic Cell
Thanks for your input. Indeed I used the calculation that you link to http://pd.chem.ucl.ac.uk/pdnn/unit1/unintro.htm in my program. I also checked my results with an online calculator at this link...- tappy
- Post #4
- Forum: Atomic and Condensed Matter
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Undergrad Calculating D-Spacings in a Monoclinic Cell
Why is it that the d-spacing of the (100) plane is not equal to the lattice cell dimension a. I can calculate the (010) and (001) d-spacings and they are equal to b & c lattic cell dimensions which is what I expected. Small bit of background. My task was to write a small program that calculates...- tappy
- Thread
- Cell
- Replies: 7
- Forum: Atomic and Condensed Matter
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Undergrad Calculating noise in a data sample - what region to use
Great thanks for that, leaving out the data between 90 and 120 makes sense but good to hear it from someone else. Indeed the noise isn't that interesting in this case however I suppose what got me worried was how should the error be presented, your suggestion of 4 average values is a good one...- tappy
- Post #5
- Forum: Set Theory, Logic, Probability, Statistics
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Undergrad Calculating noise in a data sample - what region to use
The graph shows counts along a line profile. I have calculated stdev & SE over the whole profile, over the part with signal and the part without signal so what bothers me is that if I use the SE over the whole profile as error in the data does it make sense as the SE in the part with signal and...- tappy
- Post #3
- Forum: Set Theory, Logic, Probability, Statistics
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Undergrad Calculating noise in a data sample - what region to use
I have a data set of number of counts vs position where counts were detected. I want to find the noise in the sample. Am I right to think that by 'noise' the requestor wants to know the standard error (SE = stdev/sqrt(N)) where N is the sum of x-axis points. Also if the above it true then is the...- tappy
- Thread
- Data Noise
- Replies: 5
- Forum: Set Theory, Logic, Probability, Statistics