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964 Price Analysis

Old 03-13-2018, 01:32 AM
Jbarnes RS
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Location: Oregon / Arizona
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Great work on this. Little off on the really good unique cars.

I know of 2 really special cars sold in the $125k range.

Add a mint green 91 at $100k. I just bought it.
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Old 03-13-2018, 01:45 AM
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Updated the original post with info about mileage. If anyone is interested your can recreate the regression analysis in R using the data and the following code:

porsche <- read.xlsx("Porsche 964 Price Analysis.xlsx", 1)
porsche.clean <- porsche[1:425, 1:5]
porsche.regression <- lm(Purchase.Price~Mileage, data = porsche.clean)
plot(porsche.clean$Mileage, porsche.clean$Purchase.Price)
abline(lm(Purchase.Price~Mileage, data = porsche.clean), col = "red")

@jbarnes RS - Thanks!
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Old 03-14-2018, 08:56 AM
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I know you are talking about "average" price. Your averages date back to 1991. I think if you ran the numbers from 2015 to 2018, you would have something completely different. 964's are selling in the 40K-50K range now.
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Old 03-14-2018, 05:30 PM
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As noted, there are plenty of private party sales that are not publicly advertised. I sold an '88 Targa to a neighbor who had previously asked for dibs. We agreed on a price, shook hands, exchanged keys & title for payment. The car was never officially for sale. I don't even think he told his wife... yet. Unlike real estate there are no public records of the transaction (maybe sales tax/registration but likely not public).
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Old 03-14-2018, 06:10 PM
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Simple average based upon the data gathered with a couple of outliers tossed out. Would be interesting to have a break out of C2 and C4.

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