Time series prediction using multiple series
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NAR seems to be the tool of choice for predicting future values of a single time series y, using only its past as input.
NARX is the tool when there is a second series x thought to be predictive of the first, along with that series.
What are the best approaches when there are multiple "second series" to be used, eg x1, x2,... XN ?
Thanks
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Greg Heath
2013-1-17
编辑：Greg Heath
2013-1-17
1 个投票
Before blindly using ANY time series function, determine which delays are significant.
[ O N ] = size(t); O = 1
[I N ] = size(x); I >=1
zsct1 = zscore(t,1);
zscx1 = zscore(x',1)';
Now use xcorr, crosscorr (which I do not have) or nncorr to calculate and plot, correlation functions to help determine the significant positive delays of
1. The output autocorrelation function (correlation of current output with past outputs)
autocorrt = nncorr(zsct1,zsct1,N-1,'biased');
autocorrt(positive delays) = autocorrt(N+1:2*N-1);
2. Positive delays of the input/output crosscorrelation functions (correlation of current input with past outputs)
crosscorrtx1 = nncorr(zsct1,zscx1(1,:),N-1,'biased');
crosscorrtx2 = nncorr(zsct1,zscx1(2,:),N-1,'biased');
...
crosscorrxtI = nncorr(zsct1,zscx1(I,:),N-1,'biased');
However, the time series neural nets do not allow different delays for
different components of the input.
Hope this helps.
Thank you for formally accepting my answer.
Greg
更多回答（2 个）
Abolfazl Nejatian
2018-11-23
1 个投票
here is my code,
this piece of code predicts time series data by use of deep learning and shallow learning algorithm.
best wish
abolfazl nejatian
Shashank Prasanna
2013-1-17
0 个投票
You can provide any number of exogenous inputs to your NARX network. If you are using the neural network toolbox, then just stack them all up in a cell and feed it to the network.
Run "NTSTOOL" and click 'load example data set', has some examples where they provide more than 1 X
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