The Pacific Northwest (PNW), sometimes referred to as Cascadia, is a geographic region in western North America bounded by the Pacific Ocean to the west and (loosely) by the Cascade Mountain Range on the east.
Mean time between failures (MTBF) describes the expected time between two failures for a repairable system, while mean time to failure (MTTF) denotes the expected time to failure for a non-repairable system. the MTBF is the sum of the operational periods divided by the number of observed failures.
Let's say, as an example, that you want to calculate the fall rate for the month of April on a 30-bed unit. 1  Rates are calculated as follows: 2  First, count the number of falls that occurred during the month of April from your incident reporting system. Let's say there were three falls during the month of April.