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bio website linkedin.com/pub/andy-ross/14/…
location Columbia, MO
age 31
visits member for 2 years, 3 months
seen 8 hours ago

Jul
18
comment Problem with Covariance Matrix Output in NonlinearModelFit
I suspect it has something to do with the scale of the values being so radically different that 20 digits precision isn't enough to capture it. Try working at much higher precision or rescaling your data and model somehow so that things are measured at the same order of magnitude.
Jul
18
revised Problem with Covariance Matrix Output in NonlinearModelFit
deleted 6 characters in body
Jul
18
answered Problem with Covariance Matrix Output in NonlinearModelFit
Jul
10
comment Possible to Solve a LocationEquivalenceTest?
Notice if you set the test to "KruskalWallis" the curve is a step function. It is unlikely that the p-value will ever be exactly 0.05 in this case and it isn't surprising that FindRoot would complain.
Jul
9
revised Possible to Solve a LocationEquivalenceTest?
deleted 42 characters in body
Jul
9
revised Possible to Solve a LocationEquivalenceTest?
added 127 characters in body
Jul
9
answered Possible to Solve a LocationEquivalenceTest?
Jul
2
comment Problem in simulating discrete time stochastic
The simulation starts at time t = 0. There are no wins until the second time point at t = 1.
Jun
25
revised Make a histogram by giving the range and height of each bin one by one
added 332 characters in body
Jun
25
answered Make a histogram by giving the range and height of each bin one by one
Jun
17
answered Error in ARIMAProcess example
Jun
10
awarded  statistics
Jun
8
comment Coefficient of determination (R squared) of EstimatedDistribution
It fits quite poorly in the tails of the distribution. Most of the tests available to DistributionFitTest are particularly sensitive to departures in the tail which would explain the small p-values. It also appears that you have a lot of data so it isn't surprising that you would get near zero p-values with a departure that is visible to the eye like this.
Jun
8
comment Coefficient of determination (R squared) of EstimatedDistribution
@0x4A4D actually, in this case, a p-value near zero indicates a poor fit. There are many reasons why that may be the case but it is impossible to speculate without seeing the original data.I find it is generally better to use a QuantilePlot rather than visually compare PDFs.
Jun
3
awarded  Popular Question
May
30
revised List of compilable functions
added 2 characters in body
May
27
awarded  Popular Question
May
23
awarded  Enlightened
May
23
comment 3D visualization of 4D object data
It would be helpful to have access to the data. If you can't give the actual data maybe you could give some code to generate representative data.
May
22
comment CorrelationTest small bug?
@whuber in this particular case that is essentially true. However, that is only because we happen to have set the null value to zero for CorrelationTest.