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Standard dev request

  #1  
Old 10-15-2004, 09:29 PM
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Jason, can you post the SD of each hybrid's mpg by model and transmission?

I'm betting the HCH with MT is the most consistant of all the hybrids. The Prius 2 seems all over the charts as does the HCH CVT but the HCH MT looks to have a much tighter group.
 
  #2  
Old 10-15-2004, 10:24 PM
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SD standard deviation? By transmission? No 99% of people wouldn't be interested, so to be frank it isn't worth the time.

However, I will be including a 5-number summary on the graph as soon as I am able to script it
 
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Old 10-16-2004, 06:47 AM
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I think the reason the MTs have less deviation has to do with the people, not the car.

The people who would buy a hybrid MT are not poor people who can't afford a CVT, since hybrids cost a few thousand more than non-hybrids.

And, being a hybrid, these are not people who are going for speed-record-breaking performance.

No, I think people who buy the hybrid MTs fall into a relatively narrowly-focused group who are going for the mileage.


Buyers of CVTs are a wider cross section of people.
Iím one of the hyper-milers, but I am too lazy to use a MT.
 
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Old 10-16-2004, 08:49 PM
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The SD shouldn't be too hard to come up for a programmer that has access to the database. I could do it myself but that would mean entering hundreds of entries manually. I'll do the ranges:

Insight MT: 103.5 to 53.3
Insight CVT: 53.3 to 41.0
Prius 2: 63.6 to 36.3
Prius 1: 57.3 to 42.1
HCH CVT: 58.2 to 37.0
HCH MT: 54.5 to 44.0

Yep HCH MT has the smallest range!
 
  #5  
Old 10-16-2004, 09:07 PM
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The ranges are quite simple, and for a couple weeks they were actually on the graphs, but I decided that until I got the quartiles up, they didn't really say much. Tell you what... once I get a 5-number summary up I'll think about generating a standard deviation.

Also, I used to offer the entire database for anyone to download, but as 2 million+ miles is now an extremely valuable resource, I don't think it wise to allow just anyone to "steal" the data. Now you can still download data for your own car, but that's it.
 
  #6  
Old 10-18-2004, 02:48 PM
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I think the reason the MTs have less deviation has to do with the people, not the car.
You may have a point here, as my own MPG has been fairly consistant ~58MPG.
 
  #7  
Old 10-18-2004, 05:26 PM
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