Most developers have never seen a successful project

Most developers have never seen a successful project

Is this bad science?  Since this is a retrospective study, there is non-random assignment for the treatment and control groups.  That introduces selection bias.  Projects that are more likely to implement a (long-winded) “waterfall” life-cycle approach are probably larger scale projects to begin with.  Correlation is not causation.  So, maybe it’s not the lifecycle approach that is the problem, but the confounding/lurking variable of project scale that is the problem.  The study should control for the size of the project to make a valid conclusion about success rate of the development approach used.  ie:  Building a large insurance processing system will use a lifecycle approach, while building a fitness app will not.  Apples to oranges, since one is much easier to be implement than the other.

Ivy degrees and income: Correlation vs. Causation?

Krueger and Dale studied what happened to students who were accepted at an Ivy or a similar institution, but chose instead to attend a less sexy, “moderately selective” school. It turned out that such students had, on average, the same income twenty years later as graduates of the elite colleges. Krueger and Dale found that for students bright enough to win admission to a top school, later income “varied little, no matter which type of college they attended.” In other words, the student, not the school, was responsible for the success.

Do music lessons make you smarter?

  • Year after year, researchers report associations between children’s participation in music classes and better grades, higher SAT scores and elevated cognitive skills. It’s also well known that many successful adults played instruments as children. On the basis of such evidence, you might assume that music education helped cause such positive outcomes.  That is a misguided assumption.
  • Correlation does not imply causation.   Parents who can afford private music lessons might also be more likely to read to their children than to sit them in front of the TV. Children willing to practice an instrument daily might also persevere longer than their peers on their math homework.