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Updated Price Analysis

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Old 03-21-2018, 01:33 AM
  #16  
golfnutintib
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terrific stuff - thanks for your thought and contribution

l think the one thing that is hardest to take into account is the condition of the car (and for instance, whether it needs an engine reseal or other major maintenance/rehab).

Lets try these:

1991 C2 Coupe
Stick
54k miles
2017

1990 C2 Coupe
Stick
152K
2017

1990 C4 Coupe
Stick
83k
2018
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Old 03-21-2018, 08:41 AM
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Deserion
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Originally Posted by fftfk
The model predicts your purchase price was $9443 using all of the variables and $14,114 using only significant variables. I think this is most likely due to the limited number of targa's included in the dataset.
Thanks. That's about what I was getting, but I thought I was doing something wrong. For the record, the transaction was around $17,000 (also to note the prior owner did over $10,000 in work in the three years prior to selling).
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Old 03-21-2018, 12:17 PM
  #18  
fftfk
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Originally Posted by golfnutintib
terrific stuff - thanks for your thought and contribution

l think the one thing that is hardest to take into account is the condition of the car (and for instance, whether it needs an engine reseal or other major maintenance/rehab).

Lets try these:

1991 C2 Coupe
Stick
54k miles
2017

1990 C2 Coupe
Stick
152K
2017

1990 C4 Coupe
Stick
83k
2018
The model predicts the following purchase prices:
Car 1 - $53,790
Car 2 - $41,505
Car 3 - $51,602

I completely agree about the subjective condition of the car and didn't even attempt that.
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Old 03-21-2018, 12:20 PM
  #19  
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Originally Posted by sooner964
Off topic and random question, but Is your username "fftfk" by chance a refence to signal processing techniques? FFT - Fast Fourier Transform, and FK - Frequency-Wavenumber analysis?
I could tell you but then I'd have to kill you. BTW - you need to stop looking at certain websites so often!
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Old 03-21-2018, 01:34 PM
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mbintx
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OK, I'll play:

1989 C4 Coupe
Manual
Silver/black
47K miles
Purchased 8/17
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Old 03-21-2018, 03:25 PM
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Originally Posted by mbintx
OK, I'll play:

1989 C4 Coupe
Manual
Silver/black
47K miles
Purchased 8/17
The model predicts the cost of your car was $52,745.
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Old 03-21-2018, 03:53 PM
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Earlydays
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Here's another one:
1990 C2 Coupe
Manual
GP White/Black
45K miles (105K today)
Purchased 2/1998
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Old 03-21-2018, 04:35 PM
  #23  
DTMLGND
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Cool Updated Price Analysis
OK, I'll play!

1993 C2 Coupe
Manual
GP White/Grey Sports
113K miles
Purchased 3/13
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Old 03-21-2018, 04:37 PM
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Originally Posted by Earlydays
Here's another one:
1990 C2 Coupe
Manual
GP White/Black
45K miles (105K today)
Purchased 2/1998
The model predicts you paid $27655 in 1998 and that your car is worth $49,866 today.
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Old 03-21-2018, 04:41 PM
  #25  
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Originally Posted by DTMLGND
OK, I'll play!

1993 C2 Coupe
Manual
GP White/Grey Sports
113K miles
Purchased 3/13
The model predicts you paid $25,792 in 2013.
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Old 03-21-2018, 04:54 PM
  #26  
DTMLGND
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Originally Posted by fftfk
The model predicts you paid $25,792 in 2013.
Wow! That's pretty accurate. I've got 123K now. Nice work.
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Old 03-21-2018, 05:14 PM
  #27  
Earlydays
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Originally Posted by fftfk
The model predicts you paid $27655 in 1998 and that your car is worth $49,866 today.
Good model! I paid $28,000 in 1998.
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Old 03-21-2018, 05:18 PM
  #28  
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Originally Posted by fftfk
The model predicts the following purchase prices:
Car 1 - $53,790
Car 2 - $41,505
Car 3 - $51,602

I completely agree about the subjective condition of the car and didn't even attempt that.

yes your model is very good indeed

all pretty accurate and the variances from actuals can certainly be explained by the maintenance/overhaul needs of each car (or lack thereof!) which entirely fits with common sense to be a major factor in determining the fair purchase price of these old cars ... excellent work!!!
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Old 03-21-2018, 06:50 PM
  #29  
mbintx
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Originally Posted by fftfk
The model predicts the cost of your car was $52,745.
You're about 10% high. I guess I should be happy with that outcome.
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Old 03-22-2018, 04:13 AM
  #30  
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This is fascinating work you've done. How about this one? I'd also appreciate an estimate of it's current worth as I get ready to put her up for sale.

1991 C2 Cab midnight blue/ivory in very good condition
manual transmission
55,000 miles (79,500 now)
purchased March 2010

Thanks in advance!
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