Determining clusters of time series

External question — Data Science Stack Exchange Author: RajS Original post: https://datascience.stackexchange.com/questions/120480 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I have been given time series of N stock prices and time series of K sectoral indices. (Sectoral index is index made from all stocks belonging to that sector.) I have not been given names of any of those stocks or indices. I want to know which stocks belong to the same sector and sectoral indices. I am able to cluster the stocks. But how should I decide which sectoral index time series they correspond to? Should I just cluster stocks and indices together (N+K timeseries) instead of clustering N stocks independently? Will that be correct approach?