This study examined the relationship between selected student and institutional characteristics and the retention rates of first-time, degree seeking, full-time and parttime, freshman student cohorts in public community colleges in Florida. Based on data obtained from the Integrated Post-Secondary Data System on selected student and institutional variables for three years beginning fall 2005, 2006 and 2007, retention rates were analyzed for the years beginning fall 2006, 2007 and 2008 respectively. This quantitative non-experimental descriptive study relied on multiple regression to analyze aggregated data on eight predictor variables to determine their impact student retention rates. A moderating variable (institutional size) was used to determine its influence on the relationship between the predictor variables and the criterion variable. The results suggest that gender and age were positively related to student retention rate at the parttime level, academic support expenses were negatively related to student retention rates at the part-time and full-time levels, and institutional size moderated the relationship between certain predictor variables and retention rates at small institutions. / by Ancil DeLuz. / Thesis (Ph.D.)--Florida Atlantic University, 2011. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2011. Mode of access: World Wide Web.