Lynxie Bobbles
Member
Hi folks, I've been pondering a first purchase of a used mini excavator.
I usually build some kind of predictive model to see if an offer is a good price, given several factors.
Here's my first attempt:
https://docs.google.com/spreadsheets/d/1dv4wSVJwAwMhQMKDU8zj4U2-ygMrUs0AVMjZIIGaeyQ/edit#gid=0
I've got the accuracy of the model to within $8500 of asking price on average, but I think I need some more features to improve the accuracy; I'm aiming for around $5000 average error.
So my question to you guys,
#1 One feature in particular I was some adjustment factor for the brand's reputation. All else being equal, just knowing the brand of the machine, which would you choose? If you'd indulge me, could you give a top 3 or top 5 best in your opinion, e.g. 1. takeuchi, 2. kubota, 3. case, etc? In an ideal world, there'd be plentiful reviews of each mini model, but that would be asking a lot.
#2. Am I missing some major factors in my model, apart from brand? I was thinking of adding 'total hydraulic flow' as a feature, though I would expect it correlates pretty well with the gross power.
#3 Is there a source of consumer reports for mini exes? I've looked and looked.
#4 Is there a source of tabulated data for mini exes? What I found on this forum was a couple of excellent posts by StumpyWally - e.g. https://www.heavyequipmentforums.com/threads/80-class-excavator-comparison.49290/ These are a little out of date though.
Any input on these would be a big help, and maybe this model will help others - they could add their own lines to it and assess the value of an offer or their own machine. Thank you all
I usually build some kind of predictive model to see if an offer is a good price, given several factors.
Here's my first attempt:
https://docs.google.com/spreadsheets/d/1dv4wSVJwAwMhQMKDU8zj4U2-ygMrUs0AVMjZIIGaeyQ/edit#gid=0
I've got the accuracy of the model to within $8500 of asking price on average, but I think I need some more features to improve the accuracy; I'm aiming for around $5000 average error.
So my question to you guys,
#1 One feature in particular I was some adjustment factor for the brand's reputation. All else being equal, just knowing the brand of the machine, which would you choose? If you'd indulge me, could you give a top 3 or top 5 best in your opinion, e.g. 1. takeuchi, 2. kubota, 3. case, etc? In an ideal world, there'd be plentiful reviews of each mini model, but that would be asking a lot.
#2. Am I missing some major factors in my model, apart from brand? I was thinking of adding 'total hydraulic flow' as a feature, though I would expect it correlates pretty well with the gross power.
#3 Is there a source of consumer reports for mini exes? I've looked and looked.
#4 Is there a source of tabulated data for mini exes? What I found on this forum was a couple of excellent posts by StumpyWally - e.g. https://www.heavyequipmentforums.com/threads/80-class-excavator-comparison.49290/ These are a little out of date though.
Any input on these would be a big help, and maybe this model will help others - they could add their own lines to it and assess the value of an offer or their own machine. Thank you all