Research productivity and visibility are becoming increasingly important in the individual researcher's pursuit to build his or her research reputation, be promoted to the next academic rank within an institution and gain national and international recognition among peers. This paper analyses the research trends and patterns of the academic staff of the College of Health Sciences (CHS) at Moi University in Kenya between 2002 and2014
Conceptual settingResearch productivity and visibility is increasingly becoming important in the researcher's pursuit to build his or her research reputation, be promoted to the next academic rank within an institution, and gain recognition among peers nationally and internationally (Ocholla, Mostert and Rotich, 2016, Thomson Reuters 2008). Thomson Reuters (2008 notes that universities conduct an evaluation of their research performance in order to decide what research should be supported and what should not, or which research projects and researchers should receive more support than others, especially in areas where research funding is limited. Garfield (1996) has stressed the need for the assessment of researchers' productivity and impact amid dwindling research funds by stating that "in several countries where research funding is often highly political, many of the most deserving researchers receive a small fraction of research funds in contrast to parasites who hadn't published a paper for a decade or more". When measuring productivity and visibility, the global rankings count papers published in journals that are indexed in the main global indices -such as the Science Citation Index, Web of Science or Scopus, or their equivalents for other disciplines. Thomson Reuters (2008) states that the evaluation of research performance may help university leaders "understand the institution's position relative to global and domestic standards of research production: how much research is conducted? What is its impact? How many of the faculty members' articles are published in first-class journals? Is that number of publications increasing or decreasing?" Several authors (for example, Lancaster 1991, Jacobs 2002) have observed that evaluating individual or institutional research productivity and visibility involves the analysis of the number of publications produced, assessing the extent of collaboration, and determining the quality of research being conducted.Research productivity in academia has therefore generally been regarded in terms of the number of publications produced and published in peer-refereed journals per researcher. Publication in high-status, refereed journals, for the most part published in English, has become an important route to academic success in the competitive environment of global higher education (Altbach 2014). Nicholas and Ritchie (1978) and Hertzel (1987) refer to the studies that assess the productivity of researchers as descriptive bibliometrics (sometimes called productivity count studies), where a description of the characteristics or features of a litera...