What is the formula for Standard allowed minute calculation in apparel industry?

Standard Allowed Time is computed from Live Time Study or Standard Data Analysis (SPD)

Standard Allowed Minutes (SAMs) is calculated as follows:

Total Raw Cycle Time / # valid Operation Cycles = Average Time (minutes)

Average Time x Leveling Factor = Normal Time (minutes)

Normal Time + P. F. & D. = Standard Allowed Time (minutes)

Cycle time is the time it takes for one complete unit for that operation

Operation cycles are valid if their value is within 1 standard deviation of the Average Time.

Leveling Factor is determined by the engineer for the worker being observed (not calculated when using Standard Data Analysis

P. F. & D. is Personal Fatigue and Delay a percentage added to compensate for normal working conditions and the specific operation. Personal is typical at 5% added to the Normal Time.