I'm working on creating a file to track my investments and unable to determine what index I should be referencing for each sector. Looking at Marketwatch, there are 1000s of indexes I can check. For example, if I own Apple or Microsoft stock, how can I compare it's performance to the entire Technology sector performance over the past month/year? Is it as simple as picking any Dow Jones Technology Index? Are there specific indexes for each sector that I'm not finding?
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