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Figure 1. Illustration of step activity data manipulation to standardize periods of analysis. (1) Original period of data collection extended between May (year 1) and April (year 2). (2) Data segmented into periods in years 1 (May–December) and 2 (January–April). (3) Data from year 2 (January–April) transposed to precede data in year 1 (May–December), thereby creating standardized "annual" cycle (January–December). Halsne EG, Waddingham MG, Hafner BJ. Long-term activity in and among persons with transfemoral amputation. J Rehabil Res Dev. 2013;50(4):515–30.http://dx.doi.org/10.1682/JRRD.2012.04.0066