Figure 13: Features with positive standardized coefficients(increased risk for lead poisoning) in a regularized logistic regression. In order, these are the age of the child at the time of testing, the age of the home according to the assessor, theproportion of children tested at this address in the past three years who were poisoned first at this address, the proportion of children tested at this tract in the last year who werepoisoned first at this tract, the proportion of blood tests at this address that were poisoned, the number of blood tests at this address in the past three years that were poisoned, and the number of children poisoned on this tract in the past year.