Hah I tried making an estimator like this using a multiple linear regression model in a weekend. I RE'd the android app of a local car listing portal and wrote

Hah I tried making an estimator like this using a multiple linear regression model in a weekend. I RE'd the android app of a local car listing portal and wrote a scraper. The problem was that there were way too many variables not annotated in the json but instead just thrown into the description tag. I manually extracted the key ones like AC, seat material etc but it was never accurate enough mainly because of this. Maybe one day I will try again with another site or even scrape several sites for more data.