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0answers
47 views

Investigating the correlation between this 2 set of data

The picture below shows the growth of the traffic and the total number of published articles on that website. Which functions can I use to investigate if there is a correlation between them? Both ...
1
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1answer
54 views

Traffic growth forecast: showing the change of linear regression

The following picture shows a changement in the trend of data. (The data used are available here). Is there any tool that can show this change of trend? Until now I managed to show even more ...
4
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1answer
126 views

TimeSeriesModelFit incorrect?

I am trying to determine the optimal model for time series data (1592 observations). When I run TimeSeriesModelFit, Mathematica selects $AR(1)$ model, the estimated ...
1
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0answers
70 views

Unexpected results from GARCH Processes

I'm playing a bit with Time Series and I've been trying to estimate Garch Processes from different time series. Are TimeSeriesModelFit and ...
2
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1answer
98 views

Barchart recognize time series data?

I can't seem to get Barchart to recognize TimeSeries data. For example, my data is: {{1891, 1}, {1892, 1}, {1897, 1}, {1898, 1}, {1903, 1}, {1904, 1}, {1905, 1}, {1908, 4}, {1909, 6}, {1910, ...
1
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1answer
52 views

`ResamplingMethod -> None` in `TimeSeries` does NOT take any effect in v10.1

Possible bug in v10.1 ResamplingMethod -> None in TimeSeries does NOT take any effect in v10.1. Try: ...
0
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0answers
54 views

Time series package in mathematica 9

Is the time series package already installed in Mathematica 9? I have already installed Mathematica. Do I need to install the time series package? If so, from where? or should i go for mathematica ...
13
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4answers
256 views

Cross-Correlation with TimeSeries

How to find hidden relationship between two TimeSeries data sets? I normally compute the Cross-Correlation function, but I cannot find an easy way of doing this on the TimeSeries objects in ...
2
votes
2answers
217 views

Using Periodogram to investigate the seasonality of the data

After asking how to get rid of the seasonality of this set of data, I'd like to ask how to investigate the seasonality in data using Mathematica. Which tool would you use to study seasonality? I.e. ...
4
votes
2answers
121 views

Deseasonalize the data of traffic growth for the past data

In another question (Using TimeSeriesForecast for forecasting the traffic growth) I asked to use the TimeSeriesForecast on this set of data the answer provided the plot with and without the ...
4
votes
1answer
151 views

MovingMap maps to second level unexpectedly

I'm trying to build a financial indicator in mathematica. I import some historical data ...
2
votes
1answer
157 views

Using TimeSeriesForecast for forecasting the traffic growth

Have a look to the real traffic growth data (link) of a this website. I was thinking to use Mathematica to do a TimeSeriesForecast and plot the forecast. Can you ...
3
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1answer
102 views

TimeSeries - Values & Dates

How can I display a TimeSeries object in a Table or Grid so that I could see the Dates and corresponding Values next to each other? I wrote the following code: ...
0
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1answer
34 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 ...
2
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0answers
55 views

Is there an equivalent to MovingMap[] for functions that work on more than one TimeSeries?

I have a family of functions that require two TimeSeries (A and B). As a trivial example, imagine a function called beta[tsA_,tsB_] that determines the slope of the linear regression line for the ...
2
votes
0answers
59 views

Is there a convenient way to sum TimeSeries objects in Mathematica?

Imagine I have two TimeSeries objects, ...
1
vote
1answer
89 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
1
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0answers
105 views

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

I know that if I use this code: tsm = TimeSeriesModelFit[ret, {"GARCH", {1, 1}}]; I can get the parameters using this: ...
1
vote
1answer
50 views

Why does TimeSeriesShift is just adding a fixed number of days?

I'd like to shift all contents of a TimeSeries object by one month. By shifting Feb. 1st I would expect to receive Mar. 1st. However it's not the case for Mathematica: ...
5
votes
1answer
206 views

Time Series Analysis - How does it Difference?

In languages other than Mathematica (especially R) if you want to do any time series analysis, you must always difference the series according to some feature of the series in order to satisfy at ...
7
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2answers
156 views

Fitting higher order ARIMA models hangs, never completes

I'm working with some data that is 12 month seasonal. However, when I try to fit it to an ARIMA(12,1,3) for instance, my PC's CPU cranks up to 100% and the job never finishes. Here's some sample code. ...
7
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1answer
146 views

Why are TimeSeries objects reported with head “TemporalData”?

Related Problem: What does it mean to be an object in Mathematica? I am quite surprised to find that ts = TimeSeries[ {1,2,3,4}, {{1,2,3,4}}]; Head @ ts ...
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0answers
58 views

Transfer Functions - Time Series depends on a second one

Suppose two time series ...
2
votes
1answer
145 views

Time Series fit in Mathematica

Newbie in Time Series question: I need to do a very simple (I think) regression of a time serie of the type: $Y_{t}$ = $\sum_{j=1}^{p}b_{j}Y_{t-j}$ + $\sum_{j=1}^{q}c_{j}X_{t-j}$ and I can't figure ...
2
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1answer
71 views

WeatherData and TimeSeriesModelFit

with city = CityData[{"Bremerhaven", "Bremen", "Germany"}]; and ...
5
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0answers
256 views

How to download and combine S&P 500 stock prices

I want to download historical S&P 500 stock prices and combined them into one big file, having only one column of date referencing all stocks. Here is what I have do so far. ...
3
votes
2answers
136 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. ...
3
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3answers
342 views

Partitioning time series

I have a time series dataset I'm trying to plot by Year: ...
5
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0answers
107 views

TimeSeries for non-temporal data

Mathematica introduced TemporalData in Mathematica 9. Mathematica 10 added several fantastic new TimeSeries manipulation tools ...
1
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1answer
134 views

How to combine TimeSeries of different dimensionality into TemporalData object?

I was wondering if it is possible to combine multiple TimeSeries data objects of values that have different dimensionality into one ...
3
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0answers
108 views

LogLikelihood function with Multivariate State Space Models

I load the packadge TimeSeries. Depending on the running Mathematica release, one should preliminary remove some built-in function with the same name, e.g.KalmanFilter, I used the following commands: ...
0
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0answers
147 views

Calculate the power spectral density of a Markov chain

I would like to calculate the symbolic power spectral density of a two state Markov process with a symbolic transition matrix characterised by two parameters. I have tried the below, but it doesn't ...
3
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0answers
137 views

Implementation of the Vector Autoregressive Model

I need to code/write a Vector Autoregressive Model VAR(p) as a function of the parameters. There is no estimation, nor Data involved, this is a "population" exercise: Assume X and Y are univariate, ...
10
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1answer
168 views

Can TemporalData be used as a container for TimeSeries and TimeSeries Metadata

When I create two TimeSeries with some MetaInformation I can combine them into one ...
3
votes
1answer
173 views

Problem with SARIMA Time Series Model

I'm in the process of becoming familiar with some on the version 10 new functionality. I have two data sets, datasetA and datasetC, of time series data that I would like to make forecasts on. Here is ...
3
votes
0answers
125 views

Making time-index dependent state-space models - where has the Kalman filter gone?

How does one now implement a discrete set of state space models? I had used KalmanFilter in the old TimeSeries application, but was keen on trying to do all this ...
8
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1answer
260 views

How to slice TimeSeries data?

When retrieving curated data, v10 now returns TimeSeries objects. For example, ...
3
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2answers
119 views

Slow work of TimeSeriesWindow

I have financial data (list of time-values pairs). There are more than 13000 elements. ...
1
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0answers
130 views

TimeSeriesForecast Forecasts

I am trying to make sure I understand how TimeSeriesForecast works. I apologize in advance for the basic nature of this question. I am using Mathematica 10. I ...
1
vote
1answer
198 views

Plotting Time Series with call to Wolfram Alpha

I am trying to plot stocks showing some of the local maxima. As an exercise I first tried to load Apple's stock data from Wolfram Alpha with the following code: ...
2
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0answers
123 views

Plotting multiple curves with multiple axes (>2) on the same plot

I'm attempting to generate a graph that depicts mulitple time series, measured in different units (but with a common time scale) on the same graph. This is a generalization of the familiar ...
0
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0answers
93 views

Undo differences in a time series

I have estimated and ARMA process in Mathematica using data which I have had to take the 2nd difference of to remove the trend. I have managed to fit a model to the detrended data but cannot work out ...
5
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0answers
527 views

Estimate parameters of the state space model

I'm using Mathematica 9 and its Control Systems functionality. I've searched the references extensively but seem not to be able to find any examples of state space model parameters estimation. All ...
5
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4answers
412 views

How to Merge Date and Time?

Given the following time series data where row is date and column is time intervals. ...
3
votes
1answer
116 views

Setting label in DendrogramPlot

I want to create a dendrogram with the labels being a visual representation of the data. Something like this: How can I do that in Mathematica? My attempt so far hasn't been very successful. The ...
7
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1answer
469 views

Estimation of vector autoregressive (VAR) process

To estimate 1-dimensional VAR process (which is AR process) you can easily use functions EstimatedProcess or ...
0
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0answers
193 views

Time series (stochastic process) estimating parameters using characteristic function

I have a time series of assets ${A_1, A_2, ..., A_n}$, which is described by a sophisticated distribution having the following characteristic function: $\phi(u; t;\theta)$, where $\theta$ is a vector ...
4
votes
1answer
147 views

What is the equivalent of MATLAB's “timealign” function?

What is the equivalent of MATLAB's "timealign" function? Given two sequences (lists of values) and offsets, timealign will insert 0's into sequences to align them so they have the same number of ...
4
votes
1answer
111 views

Memory usage of timeseries - lists of {Integer32, Real32}

A list of {Integer32, Real32} items in Mathematica seems to use 12-times as much memory than the C equivalent array of structs. ...
0
votes
1answer
158 views

johansen test error in code

Cross-posted at the Wolfram community forum I have found this code on a forum, apparently it worked in a previous version of mathematica. Now when I run it, it keeps running for ages. I am not able ...