[mcintyre1994]

That page is always really interesting when it comes up, but have you considered adding data for existing product improvements by acquisition? You include a variable for whether it was initially acquired or not, but perhaps big acquisitions clearly for the purpose of improving a product are a strong signal of longevity?

[gwern]

That's not a bad idea, but at this point it would be hard to go back and be able to classify each product by how many other products were merged into it. That information is not always clearly laid out publicly (to say the least).