Questions tagged [mathematica]
Mathematica is a software package for symbolic mathematical computations.
61 questions
3
votes
0
answers
532
views
How do I calculate the Bayes error of a multivariate normal Bayesian classifier?
I have a 4 dimensional feature and each of them are independent normal distributions. I want to calculate the bayesian error associated with this classifier. The covariance matrix and the mean have ...
- 131
0
votes
2
answers
361
views
How to estimate storage needs using the PERT distribution for filesizes? How to aggregate them without falling into the flaw of extremes?
Lets say I know that I am going to store the information of 10,000 people each year for 4 years, that is 40,000 files. Now If I estimate that on the best case scenario the information from each ...
- 301
2
votes
1
answer
4k
views
Best multivariate polynomial regression
I have a dataset (x,y) where x is a n-dimensional vector and y is an m-dimensional vector. (m=3, n>2) My goal is to find the best polynomial in x fitting the (x,y) dataset.
The dimension of x is ...
- 267
4
votes
1
answer
687
views
Chi-square independence in political sciences
I've been assigned to do a cross-class project between political science and math about the behavior of voters in a democratic state. More specifically, I'm focusing on a party from a national ...
3
votes
1
answer
2k
views
How to calculate confidence and prediction bands for a linear regression using Mathematica?
I need to calculate confidence and prediction bands for a linear regression that is in the general form of $y=ax$, where $a$ is the multiplier and $x$ the variable.
I found a code in
http://...
- 505
5
votes
1
answer
4k
views
Characterizing periodicity level of signal
What are some good ways of quantitatively characterizing the periodicity level of an approximately periodic $f(t), t \in \mathbb{R}$ signal?
I need this to tell if the output of some system is ...
- 1,408
1
vote
1
answer
1k
views
Normalizing error variance scale
Imagine we have two sets of data m1 and m2. m1 components have the dimension of [m^2/s] and m2 components are measured in [cm^2/s].
e.g.
...
- 505
2
votes
1
answer
295
views
Frequency of a wavelet filter
Assume that I have decomposed a data set using Symlet Wavelet with six levels. How can I estimate the approximate frequency interval of each level?
That would be great if you consider your answer in ...
- 505
8
votes
1
answer
514
views
Symbolic computer algebra for statistics
What functionality should exist in a CAS that was specifically geared toward Statistics?
Symbolic algebra systems like Mathematica and Maple are often used for calculus, logic, and physics problems ...
1
vote
1
answer
5k
views
How can I calculate the autocorrelation of a signal in Mathematica environment?
I tried CorrelationFunction[Transpose[{data,data}]][[All,1,2]] but it doesn't work! I mean the results are identical with those if I run ...
- 505
16
votes
1
answer
1k
views
Why do Excel and WolframAlpha give different values for skewness
for the following 3 values 222,1122,45444
WolframAlpha gives 0.706
Excel, using =SKEW(222,1122,45444) gives 1.729
What explains the difference?
- 351