I've owned a house for many years (well, the bank owns a lot of it too, actually) and track it's estimated value using Redfin. I have a spreadsheet history that I update each month going back years. But there's this weird bug I noticed where the estimated value gets retroactively changed.
For example, in January 2018 Redfin estimated my house at almost 2.3M. It was approximately 2.3M for several months -- before and after January -- so it was pretty stable and not some error on my part where I might have written down the wrong number one month. But now if you look at the chart for the same time period around Jan 2018, Redfin has an estimate of approximately 2M.
The value has fallen recently (per their algorithm) which is fine and probably accurate. But they're not only adjusting the current value, but retroactively decreasing the historical value. It's not really a problem for me for any practical reasons, but it just seems bizarre. It was worth what it was worth back then (and I know the original estimate back then was pretty accurate based on comps at the time), so why are they messing with the history?
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source https://www.reddit.com/r/RealEstate/comments/e2s549/whats_up_with_redfins_charts_they_seem_screwed_up/
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