On the Determinants of Measurement Error in Time-Driven Costing

Accounting Review - Tập 83 Số 3 - Trang 735-756 - 2008
Eddy Cardinaels1, Eva Labro2
1Tilburg University,
2London School of Economics,

Tóm tắt

Although employees' time estimates are used extensively for costing purposes, they are prone to measurement error. In an experimental setting, we research how measurement error in time estimates varies with: (1) the level of aggregation in the definition of costing system activities (aggregated or disaggregated); (2) task coherence (the extent to which the activities that require time estimates present themselves coherently or incoherently); and (3) when notice is given that time estimates will be required (in advance or after the fact), that is, whether participants know that time estimates will be required before they perform the activities. We also test on response mode (estimates in percentages or absolute time units). The results suggest an important trade-off between the level of aggregation and measurement error: increasing aggregation in the definition of activities leads to lower measurement error. Also, advance notification reduces measurement error, especially in settings with aggregated activities or incoherent tasks. Finally, we find a strong overestimation bias when participants provide time estimates in minutes, which may be problematic for Time-Driven Activity-Based Costing that advocates the use of estimates in minutes. These results are relevant to accountants and decision makers who want to assess and control the measurement error in their costing system and to professionals in related areas that make use of time estimates (e.g., billing, tendering).

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Accounting Review

Tập 83 Số 3

735-756

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