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Statistics
8 equations
IR-01
Total Recordable Incident Rate (TRIR)
ASP CSP Foundational
Calculate OSHA total recordable injury/illness rate per 100 full-time workers. The most commonly reported lagging indicator.
IR-02 Days Away, Restricted, Transfer (DART) Rate
ASP CSP Foundational
Calculate rate of cases involving days away from work, restricted duty, or job transfer per 100 FTE workers.
IR-03 Lost Time Incident Rate (LTIR)
ASP CSP Foundational
Calculate rate of injuries resulting in days away from work per 100 FTE workers.
IR-04 Severity Rate
ASP CSP Foundational
Calculate the rate of workdays lost due to injuries per 100 FTE workers. Measures injury severity.
ST-01 t-Test (Student’s t)
ASP CSP Advanced
Test whether a sample mean is significantly different from a population mean when population variance is unknown.
ST-02 z-Score (Standard Score)
ASP CSP Foundational
Calculate how many standard deviations a value is from the mean. Used for comparing values across different distributions.
ST-03 Poisson Distribution
ASP CSP Advanced
Calculate probability of rare, independent events occurring in a fixed interval. Used for incident rate prediction.
ST-04 Linear Correlation Coefficient (r)
ASP CSP Advanced
Measure the strength and direction of linear relationship between two variables.
