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.
Scale of the devastation of the Boxing-day tsunami. 1  275,000 people were killed in fourteen countries across two continents, with the last two fatalities being swept out to sea in South Africa, more than twelve hours after the earthquake. Speeds of 500km/h were reached as the tsunamis radiated through the Indian Ocean. 2  In the worst cases, the waves reached over. 3  Tsunamis reached 20m in height at landfall in parts of Aceh. 4  In other locations they spread 3 km inland carrying debris and salt water with them.