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2
votes
3answers
78 views

How can I incrementally calculate a time series average?

If I have a time series s, and if you'll pardon the pseudo code, such that s = {t_i, v_i} is there an easy way to calculate the series ...
4
votes
1answer
75 views

White noise at non integer intervals, bug or my mistake?

I'm intending to add white noise to a simple periodic signal ...
1
vote
0answers
48 views

Covariance of TimeSeries in v10.0-10.3

The following works in v11.2-12.0: ...
4
votes
1answer
237 views

Structural Breaks in a Time Series Model

The Chow test is a test of whether the true coefficients in two linear regressions on different data sets are equal. In econometrics, Chow test is most commonly used in time series analysis to test ...
2
votes
1answer
110 views

EstimatedProcess estimate biased?

I'm estimating the ARProcess parameters of a set of 1000 time series generated with an ARProcess and RandomFunction. Each time ...
2
votes
1answer
84 views

How to get standard errors of fitted noise variance and constant for random process, e.g., ARProcess from TimeSeriesModelFit

I want to know how to get the standard errors (and hopefully the CovarianceMatrix) for the constant and noise variance parameters of (say) an ...
1
vote
1answer
64 views

Creating time varying 2d coordinates with OrnsteinUhlenbeckProcess

I see that I can create time varying 1d data with e.g. ...
0
votes
2answers
351 views

Power spectrum density calulation with ARProcess

I have a measurement of $x$ coordinates of an oscillating particle at presence of noise taken at constant time steps of 1/60 s. The corresponding data set can be obtained here: https://drive....
0
votes
1answer
111 views

Fit process parameters to a transformed AR(1) process

I would like to fit the parameters of an exponented AR(1) process using Mathematica's EstimatedProcess, however, the function does not seem to evaluate to anything. First of all I create the ...
1
vote
1answer
565 views

How do you graph the confidence intervals that results from a GARCH over a time series?

Please, does someone know how to draw a confidence intervals (from the results of a GARCH (1,1)) in a way similar to these: *Asume an ARMA(1,1) fit the time series. Thank you very much
6
votes
0answers
423 views

How can I model the volatility, using a GARCH(1,1), of a time series of returns (and plot it) using Mathematica? [closed]

I know that if I use this code: tsm = TimeSeriesModelFit[ret, {"GARCH", {1, 1}}]; I can get the parameters using this: ...
10
votes
2answers
964 views

How to formally tell if one time series affects another?

In time series analysis, a correlogram, also known as an autocorrelation plot, is a plot of the sample autocorrelations. I'm rolling my own now and I'm not a statistician, but I think this sort of ...
3
votes
2answers
185 views

RandomFunction and Histograms

RandomFunction[QueueingProcess[3, 5], {0, 15}] Histogram[data, Automatic, "PDF"] gives a very nice way to see the histogram based on the specified process. ...
9
votes
3answers
1k views

Estimation of vector autoregressive (VAR) process

To estimate 1-dimensional VAR process (which is AR process) you can easily use functions EstimatedProcess or ...
4
votes
1answer
615 views

AR(1) Process first term

I'm trying to generate a very simple AR(1) Process with Mathematica using the ARProcess[] function. The process must have the following format: $Y_t = \alpha + \...
1
vote
2answers
327 views

build and estimate a time series process

I want to generate an EGARCH process. My problem is that I do not see how to create new processes beyond those available. The process itself is : $$\epsilon(t) = \sigma(t) \eta(t)$$ $$\log(\sigma(t)...
7
votes
2answers
1k views

Fitting data to an ARProcess using FindProcessParameters

I have 50 data points that I would like to represent as an AR(4) process. I'd like to over-plot the behaivor of the estimated process model with that of the original (raw) data before I use the model ...