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Re: [adatesman] Mis-centered axle holes in cam lobes:
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jt512
Jun 18, 2009, 7:11 PM
Views: 5110
Registered: Apr 12, 2001
Posts: 21904
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adatesman wrote: jt512 wrote: Aric, every time I look at results like this, the first question that pops into my head is, "How do these compare with other brands of cams?" I honestly think that it is imperative that each time you present results for Aliens, that you include results for other brands, as a control—at a minimum, include a link to such results. Otherwise, you are essentially presenting the results of an uncontrolled experiment. The reader has no way of knowing whether these results are unusual, or not. Jay I guess I don't see the point, Jay, as the results from a bunch of other cams are back in the OP of this thread. I didn't measure the angles for them as they're all really close to correct and most likely within the error induced by the photos and Cam Fitter software.
But that's exactly the kind of quantitative data we need to draw conclusions about brand! That's what doing controlled experiments means! You have to have a control group that you do the same measurements on. And then you compare the results of the control group with the hypothesis group.
So the first problem is that there is missing control group data.
The second problem is presentation. The data are scattered through multiple posts in multiple threads, and for the most part, only the raw data are presented. You don't have a table anywhere summarizing the data. If I wanted to know (and I do want to) how many Aliens and non-Aliens you've measured angles on, how many were scanned vs. photographed, what the average deviation from advertised cam angle was per brand, what one source could I go to for that information. The narratives and the pictures are great—necessary, even—but the data has to be summarized too. When you read a published paper, you can look at a few tables and understand the main study results. That's what's missing here, I think. I think what you should do is to summarize all the data you have in a single table and post that table in the OP of this thread.
Edit: To summarize:
1. All the data should be in a single spreadsheet, or database.
2. The data from that database should be summarized into a single table that is prominently included in the OP.
3. As new data is obtained, it should be added to the database in (1) and the table (2) should be updated.
Jay
(This post was edited by jt512 on Jun 18, 2009, 7:15 PM)
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Edit Log:
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Post edited by jt512
() on Jun 18, 2009, 7:15 PM
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