Rosalina, EncikSugiarto, SigitGamal2016-02-042016-02-042016-02-04wahyu sari yenihttp://repository.unri.ac.id/xmlui/handle/123456789/7908This article discusses the use of numerically Holt-Winter method in predicting the number of visitors to University of Riau library. This method is divided into two, additive and multiplicative Holt-Winter methods. Furthermore, the identi cation of the seasonal variance is carried out to select an appropriate Holt-Winter method and to measure the forecasting error numerically based on the mean absolute percentage error.enHolt-Winter methodsimple linear regressiontrendseasonalmean absolute percentage errorstudent Paper Post Degree