Observational Studies and Experimental Studies

[Este artículo está disponible en español. La traducción al español apareció por primera vez en la revista Pensar.] Research studies can be divided into two types: observational studies and experimental studies. Observational studies simply observe the effect of a variable in a population. They can assess the strength of a relationship, for instance between dietary

Estudios observacionales y estudios experimentales

[This article is also available in English. Thanks to Pensar for the Spanish translation.] Los estudios de investigación médica se pueden dividir en dos tipos: observacionales y experimentales. Los estudios observacionales simplemente observan el efecto de una variable en una población. Pueden evaluar la fuerza de una relación, por ejemplo, entre factores dietéticos y enfermedades.

Psychology and Psychotherapy: How Much Is Evidence-Based?

Despite all those Polish jokes, Poland has its share of good scientists and critical thinkers. A superb new book illustrates that fact in spades: Psychology Gone Wrong: The Dark Side of Science and Therapy, by Tomasz Witkowski and Maciej Zatonski, http://www.amazon.com/Psychology-Gone-Wrong-Science-Therapy/dp/1627345280  Witkowski is a psychologist, science writer, and founder of the  Polish Skeptics Club; Zatonski

Fun With Statistics

Statistics is the essential foundation for science-based medicine.  Unfortunately, it’s a confusing subject that invites errors and misunderstandings.  We non-statisticians could all benefit from learning more about statistics as well as trying to get a better understanding of just how much we don’t know. Most of us are not going to read a statistics textbook,

Snake Oil Science

For my first blog entry, I wanted to write about something important, and I couldn’t think of anything more important than a recent book by R. Barker Bausell: Snake Oil Science: The Truth About Complementary and Alternative Medicine. If you want to understand how medical research works, if you want to know what can lead

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