Quartiles, quintiles, centiles, and other quantiles.
نویسندگان
چکیده
منابع مشابه
Against quantiles: categorization of continuous variables in epidemiologic research, and its discontents
BACKGROUND Quantiles are a staple of epidemiologic research: in contemporary epidemiologic practice, continuous variables are typically categorized into tertiles, quartiles and quintiles as a means to illustrate the relationship between a continuous exposure and a binary outcome. DISCUSSION In this paper we argue that this approach is highly problematic and present several potential alternati...
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Conventional boxplots (Tukey 1977) are useful displays for conveying rough information about the central 50% of the data and the extent of the data. For moderate-sized data sets (n < 1000), detailed estimates of tail behavior beyond the quartiles may not be trustworthy, so the information provided by boxplots is appropriately somewhat vague beyond the quartiles, and the expected number of “outl...
متن کاملThe Effect of Education on Labor Wages in Iranian Urban Households Based on Quantile Regression
The purpose of this article is to examine the impact of education and work experience on earning. For this purpose, Mincer’s wage equation, quantile regression estimation method and the microdata from Iranian survey of household income and expenses in 2016 have been used. Estimation results show that education returns are positive in all income quantiles, and education in lower-income quantiles...
متن کاملDiscussion: Conditional Growth Charts
I will use the terms “reference centiles” or “centile charts,” as the setting that I consider here is more general than that of “growth charts.” Longitudinal reference centiles over some measure of time (typically age) are almost always implemented repeatedly on the same individual. In this kind of setting the notion of conditional or adaptive centile charts is very appealing, particularly when...
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OBJECTIVE To investigate whether high levels of screen time exposure are associated with self-perceived levels of attention problems and hyperactivity in higher education students. DESIGN Cross-sectional study among participants of the i-Share cohort. SETTING French-speaking students of universities and higher education institutions. PARTICIPANTS 4816 graduate students who were at least 1...
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عنوان ژورنال:
- BMJ
دوره 309 6960 شماره
صفحات -
تاریخ انتشار 1994