Similar to random variable, uncertain variable was defined as a measurable function on the uncertainty space.
The outcome variable was defined as county-level proportion of enrollees who ever used endoscopy over the interval.
The cumulative cost variable was defined as the sum C i Cum : = ∑ k = 2 K C ik.
By means of a mathematical way, a fuzzy variable was defined as a function from a possibility space to the set of real numbers by Liu [3].
The dependent variable was defined as monthly OOPE per household and several socio-economic characteristics of the household were used as covariates: household structure or household life cycle, adults' age structure, adults' education level, public and private insurance characteristics, sex of the householder, income level, and degree of urbanization.
The primary outcome variable was defined as the difference in temperature between the start of instrumentation and after 30 s when comparing the different implants and the maximum rise in temperature (deltaTmax) where results were averaged per experimental condition (type of device, with or without coolant).
This clinical variable was defined as the revised Gleason score.
The primary dependent variable was defined as the proportion of qualitative research studies in the medical literature.
The employment status variable was defined as holding a full time or part time wage or salary position, including domestic service but excluding informal sector piecework activities.
The dependent variable was defined as the individual bias score, which is the total gaze duration spent on threatening faces minus the gaze duration spent on happy faces.
The dependent variable was defined as offering any HHR education including an elective or required course or seminar, or one or more modules of an elective or required course.
