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.
Two big earthquakes that struck off the Indonesian province of Aceh on Wednesday caused the deaths of five people - three from heart attacks and two from shock, disaster officials say. They have expressed relief over the low casualty figures; 70,000 people died in the 2004 tsunami in Aceh. However the chaos caused by the 8.6 and 8.3 magnitude quakes enabled about 49 inmates to escape from prison. Scientists meanwhile have been explaining why there was no tsunami.