Longitudinal Analysis of Arabica Coffee Bean Yield: Application of Linear Mixed Model for Clustered Longitudinal Data

1 Biometrics, Ethiopian Institute of Agricultural Research, P. O. Box 2003, Addis Ababa, Ethiopia 2 Associate Professor, School of Public Health, Addis Ababa University, P. O. Box 9086, Addis Ababa, Ethiopia 3 Department of Statistics, College of Natural Science, Jimma University, P.O. Box 378, Jimma, Ethiopia 4 Ethiopian Institute of Agricultural Research ,Jimma Agricultural Research Center, P.O. Box, 192, Jimma, Ethiopia Corresponding author’s E-mail: tare.aragaw@gmail.com