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bio website linkedin.com/pub/andy-ross/14/…
location Columbia, MO
age 32
visits member for 2 years, 11 months
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2d
comment RandomVariate form a Specific Distribution with Restrictions
TruncatedDistribution may be what you are after.
Dec
12
comment Linux: Mathematica crashes when clicking documentation links very fast
The work around is to click slower :p
Dec
10
comment TemporalData, RandomFunction, Loops: Extracting data from TemporalData sets?
The graphs show the total number of paths at time t that have positive state. So, if we look at the last graph there are 50 paths with positive state until about t = 16.5 or so. At around t = 17.5 the number of paths with positive state is around 20.
Dec
8
comment Why are TimeSeries objects reported with head “TemporalData”?
I absolutely agree.
Dec
8
comment Why are TimeSeries objects reported with head “TemporalData”?
This is also true of EventSeries. Out of curiosity what information are you losing? You can always check for a single path with the "PathCount" property. There is also an undocumented "ObjectType" property which will tell you if it is a TimeSeries or generic TemnporalData object.
Dec
8
comment Copula - Correlation or Covariance
Allowing for the Covariance is more general than using a Correlation matrix. You can assume unit variance and they are equivalent.
Dec
7
comment Most efficient searching algorithm in a table
@Rojo that is a very clean and fast solution (though not quite as fast as the compiled function). I didn't even know about FirstPosition so thanks for that! It is worth noting that for machine reals this looks for exact equal, even adding $MachineEpsilon will cause it to return Missing["NotFound"].
Dec
6
comment The CorrelationMatrix is equal to corrcoef of Matlab?
It's not a dumb question but it is difficult to verify without both software packages and the right expertise. I do know that the Mathematica property is the correlation of the parameters ( the diagonal of the covariance matrix property is their variances) a brief look at the docs for the matlab function makes me think it is more akin to mathematicas Correlation function rather than the fitted model property.
Dec
6
comment Time Series fit in Mathematica
The built in functions for time series dont currently handle covariates. I highly recommend looking at RLink since R has some fantastic and very mature time series functionality like the auto.arima function.
Dec
5
comment Method of moments using just the moments?
@bills however if the moments they have are the parameters they wouldn't need to estimate. I think they have a situation where the parameters of interest are some function of the moments
Dec
5
comment Method of moments using just the moments?
You will have to do this yourself but depending on the distribution it shouldn't be difficult. If you need help with a particular example you can always add it to your question.
Dec
1
comment FindDistributionParameters and Hypothesis Testing
Not off hand. I'm sure someone over at stats.stackexchange.com could get you started
Dec
1
comment Can one upload .xls in a cdf style gui? how would someone go about this?
@AlbertRetey I think they mean the ability to drag and drop an xls file in to upload it
Dec
1
comment Drawing a square root spiral
That is a beautiful result! +1
Nov
28
comment Generating Random Real numbers with certain numbers not included
I might ask how sure you need to be. The probability of generating a machine number that is detected as equal to 3. is very very small. Somewhere on the order of 10^-12 when you only generate 1000 of them in that range. It is about two orders of magnitude smaller if you are checking for equivalence (===).
Nov
24
comment Compilation of a function that needs to call Subsets
You are much more likely to get a response with some short example code that demonstrates what you are trying to do.
Nov
19
comment Strange interaction between Module and ListPlot
I can reproduce this on "10.0 for Mac OS X x86 (64-bit) (September 10, 2014)" using OS X Yosemite. Must be a platform-specific bug. You should report it to WRI.
Nov
19
comment Strange interaction between Module and ListPlot
What version are you using? I've tried this on Windows M9 and M10 and don't see the issue.
Nov
17
comment what is The Formula behind the Kolmogorov-Smirnov test statistics?
I can't replicate your result of 0.226532 using the distribution you suggest.
Nov
12
comment on Kolmogorov-Smirnov test
I don't think you will be able to use the built in KS test with this distribution. You could easily construct your own Chi-Square test using this answer