Identifying factors related to students' English proficiency levels through a segmentation method

English is regarded as the common language all over the world. It is used as the language to communicate in politics, economy, tourism, and education in addition to many other fields. As the need to communicate in English increases, teaching English as a foreign language and testing of English become more significant in Turkey as well as worldwide, and methodologies for the development of proficiency in English has already become a predominant research area. This study aimed to explore via a segmentation method the relationship between reading and listening sub-dimensions of English language proficiency and selected background factors related to high school and university placement examination. The research was conducted at a foundation university, in Ankara, Turkey. The sample consisted of 645 students. The data were provided by university database. The results revealed different predictor variables for reading and listening proficiency.