Aside from the correlation !=> causation issues, there's a ton of endogeneity and selection bias in this data. The initial programming quiz has code snippets o

Aside from the correlation !=> causation issues, there's a ton of endogeneity and selection bias in this data. The initial programming quiz has code snippets only in Javascript, Ruby, and C. The interviewers are usually more familiar with more modern technologies. Indeed "enterprise" (C# or Java) developers tend to do poorly at TripleByte, and Java is highly correlated with Eclipse usage. TripleByte also recruits primarily for startups which tend to use certain technologies. I'd say the final stage offer data is so biased by the selection process along the way that it's almost impossible to draw any conclusions from it.