I liked this article, and it nicely demonstrates the concept of âcontrolling for other variablesâ (IQ, career, income, age, etc) in order to best isolate the true relationship between just the 2 variables in question.t also should be noted that controling for other variables does only make sense when the explanatory variables are moderately correlated (collinearity). In the aforementioned example, the Product-Moment correlation between exposure and covariate is 0.50, i.e. 2.
In Indonesia, at least 3,000 of the dead were in Banda Aceh, the capital of Aceh province, and officials said the death toll was likely to rise. Communication with many coastal areas was impossible, and the extent of the damage there remained uncertain.
Ardito Kodijat, the director of the Indian Ocean Tsunami Information Center in Jakarta, says Banda Aceh and other coastal cities in Indonesia need to establish well-marked evacuation routes and conduct regular tsunami drills. Many people in Banda Aceh, he says, didn't know that evacuation centers had been built. Others, having witnessed the ferocity of the 2004 tsunami, thought the structures would be unsafe, and tried to escape inland instead.