When we write vectors as matrices, we tend to write an $n$-dimensional vector vector as $n \times 1$ column matrix. We emphasize that the gradient vector is defined only for scalar-valued functions. For vector valued functions, we will stick with viewing the derivative as a matrix.
Gloomy Addiction Relapse Statistics. Drug and alcohol rehab statistics show that the percentage of people who will relapse after a period recovery ranges from 50% to 90%. This is a frightening statistic and it is often used as justification for those who wish to carry on with their addiction.
In 2012, 12.6 percent of motorists, or about one in eight drivers, was uninsured, according to a 2014 study by the Insurance Research Council (IRC). The percentage has been declining in recent years. Oklahoma had the highest percentage of uninsured motorists, 26 percent, and Massachusetts had the lowest, 4 percent.