What is a binary variable? A dichotomous variable, one that can assume only two values.Reference page(s): 213 What are common logarithms? Base-10 logsReference page(s): 217 What is a likelihood function? A number that summarizes how well a model's predictions fit the observed data.Reference page(s): 224 What is logged likelihood? The natural log of likelihood. MLE models generally maximize the sum of logged likelihoods rather the product of probabilities for computational reasons.Reference page(s): 225

 What is logistic regression? a nonlinear regression model that relates a set of explanatory variables to a dichotomous dependent variable What is a logistic regression coefficient? a multiple regression coefficient based on the logistic model What are logits? A shorthand reference for natural log transformations of odds.Reference page(s): 217 What is maximum likelihood estimation? The parameter that is most consistent with the observed data. In other words, the observed data has a greater chance of occurring when the parameter equals the maximum likelihood estimate compared to the parameter equaling any other number.Reference page(s): 223

 What are natural logarithms? Base-e logarithms; base e is approximately equal to 2.72.Reference page(s): 217 What are odds? the ratio of the frequency of one event to the frequency of a second eventReference page(s): 215 What is an odds ratio? a measure of association between two dichotomous variables in which the odds of having a trait or property in one group are divided by the corresponding odds of the other groupReference page(s): 216 What is a percentage change in the odds? Expressing the change in odds (as a result of a unit change in some explanatory variable) as a percentage.Reference page(s): 216

 What is a probability profile? Identifies the change in the probability of an event occurring from a change in the value of independent variables. Reference page(s): 230 What are sample averages? Researchers generally estimate the effect of a change in the value of an independent variable on the probability of an event occurring for an observation with sample averages of other explanatory variables.Reference page(s): 230