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.
Variable Costs: Variable costs are costs that change with the amount of work. Examples of variable costs are hourly labor, the cost of material, the cost of supply, fuel for bulldozer etc. Direct Costs: Direct costs are expenses that are billed directly to the project. Examples of direct costs are team travel expenses, team wages, the cost of material used in a project, costs incurred for recognition and awards materials used to construct a building.