In medical research, cross-sectional studies differ from case-control studies in that they aim to provide data on the entire population under study, whereas case-control studies typically include only individuals with a specific characteristic, with a sample, often a tiny minority, of the rest of the population.
(redirected from Variable Expense) Also found in: Dictionary, Wikipedia. A cost that is directly proportional to the volume of output produced. When production is zero, the variable cost is equal to zero. A cost to a person or business that varies over time according to a number of factors.
How to Identify Expenses as Mixed, Fixed or Variable. Business expenses can be fixed, which are expenses like rent that are always the same; variable, which are expenses that change from month to month; or a mixture of fixed and variable. Identify mixed, fixed or variable expenses in a business with help from a business professor in this free video on business expenses.