October 2010
Beginner to intermediate
624 pages
24h 9m
English
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Some Comments on the Statistical Methodology
Statistical analyses are subject to threats to the validity of the conclusions extracted from the data. Returning to the exit poll example given in the introduction to this chapter, the socioeconomic profile of the interviewees might bias the results of the exit poll. A robust exit poll requires a random sample to be selected; otherwise, the poll will not accurately predict the actual results of the elections. Along the same lines, the results shown in this chapter might be biased because of some threats to validity, and the conclusions might not hold for other software projects. For the sake of the completeness of our analysis, we discuss the threats to validity:
The first problem you might have spotted is regarding the level of significance of the correlations shown in the previous sections. Because of the statistical properties and the size of the samples (in the range of hundred of thousands), this level of significance will always be very high (in the order of 99.99%).
From a software development point of view, this study should be extended to other programming languages. The conclusions shown here for C might not hold for other languages. Although C is currently the most popular language in the open source community (in terms of available code), other languages are also very popular, growing much faster than C, and have vast amounts of code available.
Finally, all the source code used for this study was released as open source. Although ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.