Questions on the use of mathematical techniques to extract properties from given data. Consider if your question might be more suited for Cross Validated (stats.SE) instead.
Questions tagged [data-analysis]
1056 questions
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Methods of data presentation
A friend of mine was talking about how method of data presentation can influence people's interpretation of the data, and I was wondering how much truth there is to it. The specific example was a controversial diagram, showing the difference in IQ…
Guy4164
- 11
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1 answer
Why can't we use PCA to calculate MCA?
I like to know what is the key difference between Minor component analysis (MCA) and principal component analysis (PCA) that there is a different algorithms in the literature for computing MCA, but one might say why not calculating principal…
Bob
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how to produce data for filtering (specifically ekf and ukf)? -or- can you supply me with data?
I am currently implementing Kalman filters (I have EKF and UKF) and need some data to test my codes in matlab. I have a set of samples I used, but I need more. How do i produce more data? Say I wrote:
$$ t=1:0.001:22 $$
as time samplings, with…
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Finding the number that's less than 90% of result set
Forgive if this sounds vague or poorly worded. I'm struggling to pinpoint the right terminology of what I'm looking to do. Hoping someone here can push me in the right direction.
So I have a set of numbers. Say:
$15, 22, 15, 10, 20, 20, 13, 13, 22,…
mBrice1024
- 133
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1 answer
Using Excel to calculate relative difference between three numbers
Background
I am trying to produce a table of values for the positioning of the hands of a clock at any time, limited by one second intervals, to demonstrate the feasibility of an ultra precise, digitally rendered analogue clock.
One integer unit…
Jamie W
- 57
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1 answer
Function to convert all -ve numbers into their +ve counterparts without affecting present +ve values (-12 to 12)
I am essentially after a function that will convert negative values in my Excel spreadsheet into their positive equivalents without affecting the present positive values.
A sample of my data would…
Jamie W
- 57
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Peak Picking in Spectrum Data (MS Excel)
I'm working often with spectral data of various gases, and the bulk of the data analysis is assigning the peaks with maximum signal (y-axis) to frequency (x-axis). Often we have several thousand data points, and it can be quite difficult to…
Stagg C.
- 101
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1 answer
How do i estimate an equation of best fit of a sort-of exponential equation given it's points?
There is an unnessarly long table of values of an item in a game that grants experience to a player based on one's level in the chosen skill. I think it would be much more appropriate to cite the equation of the relationship between exp and level,…
Alexander
- 339
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2 answers
What property of $n$ does this test?
I have the following sample data:
1 true
3 false
12 false
10 true
7 true
9 false
8 false
My question is, what property of $n$ does this test?
I have tried several things like prime number, composite number,…
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comparing empirical data to a model prediction using exponents
I am not a mathematician, but I have a basic question about comparing numbers with exponents near $1$. I am evaluating how well a "model" works and I want to make a compelling case.
For example, my model suggests
$$\frac{x_1}{x_2} =…
britta
- 1
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Finding a general formula for a data series
I have some numerical data tables, with a column of calculated results based on three inputs in each row.
How can I find the formula to apply to the inputs and recalculate the same result ?
the data series is formatted as such (excel file…
Bikay
- 31
-2
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1 answer
If I have a vector of number and I set all the non zero value to one, can this be defined a "Normalization" process?
Hi all I have a vector of Numbers like this:
L = [[0,1,2,0],[0,0,1,5]]
and I have transformed it like this, so all the non zero and higher than 1 numbers has been set to 1
L = [[0,1,1,0],[0,0,1,1]]
Can this operation be defined as a Normalization?…
Python
- 9