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# Math and Science Solutions for Businesses/How to calculate a monthly incident rate

Question
The annual incident rate is the # cases x 200,000/ # of hours. How do you calculate the OSHA incident rate monthly?

The yearly rate, Ry, = incidents/year, is a number given by your formula for # of cases and # number of hours (not quite sure what that last number refers to). To convert it to a monthly rate, Rm, we just need to convert the units as follows:

Rm[incidents/month] = Ry[incidents/year]･[years/month] = Ry･(1/12)

where (1/12) = [years/month]. Note that that "year" units cancel and the "incidents" now get divided by "month". So

Rm = (200,000/12)･(# of cases/# of hours)

Randy
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Math and Science Solutions for Businesses

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#### Randy Patton

##### Expertise

Questions regarding application of mathematical techniques and knowledge of physics and engineering principles to product and services design, optimization, prediction, feasibility and implementation. Examples include sales and product performance projections based on math/physics models in addition to standard regression; practical and cost effective sensor design and component configuration; optimal resource allocation using common tools (eg., MS Office); advanced data analysis techniques and implementation; simulation and "what if" analysis; and innovative applications of remote sensing.

##### Experience

26 years as professional physical scientist and project manager for elite research company providing academic quality basic and applied research for government and defense industry clients (currently retired). Projects I have been involved in include: - Notional sensor performance predictions for detecting underwater phenomena - Designing and testing guidance algorithms for multi-component system - Statistical analysis of ship tracking data and development of anomaly detector - Deployed vibration sensors in Arctic ice floes; analysis of data - Developed and tested ocean optical instrument to measure particles - Field testing of protoype sonar system - Analysis of synthetic aperture radar system data for ocean surface measurements - Redesigned dust shelters for greeters at Burning Man Festival Project management with responsibility for allocation and monitoriing of staff and equipment resources.

Publications
“A Numerical Model for Low-Frequency Equatorial Dynamics” (with Mark A. Cane), J. of Phys. Oceanogr., 14, No. 12, pp. 18531863, December 1984.

Education/Credentials
MIT, MS Physical Oceanography, 1981 UC Berkeley, BS Applied Math, 1976

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Am also an Expert in Advanced Math and Oceanography