Hi ondansetron and hlsmith, thank you for your answers! Ok, let me clarify. The data that I'm using are auto-generated from agent-based simulations. The agent-based model simulate a population with different characteristics. Each combination of characteristics produces a different scenario. The population is split into a majority and a minority. What I want to study is the rate of survival (time to extinction) of the minority group based on different characteristics. For example, there is a variable that defines their level of "exogamy", i.e. how frequently minority people couple with majority people. My assumption is that offsprings of such couples are going to be considered majority individuals, therefore reducing the proportion of minority individuals in the whole population. The variable "exogamy" varies between 0 and 100% (that is, I artificially create scenarios in which people have an exogamy rate varying between 0 and 100%) in steps of 20 points (in other words, not scenario has an exogamy rate of, say, 10% or 31%). This clearly has an impact on the time to extinction of the minority. Larger exogamy rates are associated to quicker decline. Now, here's the question: if the estimated coefficients for this variable are 0.108483 (coef) and 1.114587(exp[coef]), how do I interpret them? Thanks!