Hello HN. One of the ways in which I wanted to improve my trading was to have an overview of how different groups within the market perform, and ultimately double down on the strongest or weakest ones. I wasn't happy with the existing sector / industry indexes or ETFs as they tend to be based on a small selection of stocks or use market cap scaling which I never felt was giving me a good picture of how a group, as a whole, performs. So I built ismarkethigh.com where I compute aggregates myself using over 4500 stocks from NYSE and NASDAQ exchanges. If you are interested you can find more detail about the aggregates in the "About" section of the page.

I already find it useful in selecting specific groups and stocks to trade in so I hope it can help others as well. This is still very much a work in progress so any feedback is very welcome!