Currently, we provide data on a sector's performance based on various ETFs that imitate a particular sector:
Ex. Sector ETFs - This section classifies the various sectors within the US market and provides a reference ETF for that sector. The ETFs performance is indicative of the sector's performance
https://seekingalpha.com/etfs-and-funds/etf-tables/sectors
Other Market segments include
• Country ETFs• Bond ETFs
• Commodity ETFs
• Market Cap ETFs
Etc.