Table 1. Accepted Guidelines for a Normal TCD Study. TCD, transcranial Doppler; MCA, middle cerebral artery; ACA, anterior cerebral artery; PCA, posterior cerebral artery; TICA, terminal internal carotid artery; ICA, internal carotid artery; OA, ophthalmic artery; VR, vertebral artery; BA, basilar artery.
A change in accounting principles, accounting estimates, or the reporting entity. A change in an accounting principle is a change in a method used, such as using a different depreciation method or switching from LIFO to FIFO. An example of an accounting estimate change could be the recalculation of machine's estimated life due to wear and tear.
Methods of Depreciation. Some of the most common methods used to calculate depreciation are straight-line, units-of-production, sum-of-years digits, and double-declining balance, an accelerated depreciation method. The Modified Accelerated Cost Recovery System (MACRS) is the current tax depreciation system used in the United States .