Despite these advantages,traditional feedback identificationtheories often suffer from the opinion that they usually addresstwo-variate time-series data and are inappropriate for large-scalenetworks because of their practical and theoreticallimitations.Data acquisition is difficult or connectiveentanglements are fearing,which might hinder their applications tovery large datasets, as occur more and more frequently nowadays.Now this is not the case,as many new experimental techniques, forexample,real-time PCR,immunofluorescence,microarray,multi-electrode array and EEG;can nowprovide such time-series data in a cost efficient manner. Also amulti-variate time-series analysis theory has undergone a greatdevelopment.The new theoretical contribution much helps to find thefeedback loops in large-scale networks.
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