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.
Six people have been killed in a volcanic eruption on a tiny island in Indonesia, officials have said. Mount Rokatenda, on the island of Palue some 2,000km (1,250 miles) east of Jakarta, spewed ash and rocks 2km into the air. 3km exclusion zone was set up after an eruption last October. But Surono, a spokesman from Indonesia's volcanology agency, said many villagers had become accustomed to the volcanic activity and ignored the mandatory evacuation order. Palue has a population of some 10,000 people.