Actuarial science

Actuarial science is a specialized discipline that applies mathematical and statistical methods to assess risk. Risk refers to the chance that an uncertain event will occur. Professionals who practice this science are called actuaries. They work across many different industries, including insurance, pensions, finance, investment, medicine, and psychology. Their primary goal is to use mathematics to identify risks so they can mitigate them. By predicting potential future events, they help organizations prepare for financial uncertainty.

To perform these complex tasks, actuaries rely on several interrelated subjects. These include mathematics, probability theory, and statistics. They also utilize knowledge from finance, economics, financial accounting, and computer science. Actuaries must often pass a series of rigorous professional examinations to prove their competence. These exams focus heavily on probability and predictive analysis. Predictive analysis is the use of data to guess what might happen in the future. Modern actuaries also use high-speed computers to run sophisticated models.

The field has seen major shifts in how it functions. Historically, actuarial science used deterministic models to build tables and determine premiums. Deterministic models rely on specific, fixed inputs to reach a result. However, since the 1980s, the field has undergone revolutionary changes. The rise of high-speed computers allowed for the use of stochastic models. Stochastic models account for randomness and uncertainty. These models are often combined with modern financial theory to create more accurate predictions.

Actuarial science is applied to many distinct subfields. In life insurance, the focus is on mortality analysis and life tables. Actuaries use compound interest to create annuities and endowment policies. In the health insurance sector, the focus shifts to different contingencies. Actuaries analyze rates of disability, morbidity, and fertility. They also study how the geographical distribution of medical services affects costs. This research helped create the Resource-Base Relative Value Scale at Harvard.

The pension industry relies heavily on actuarial methods to manage long-term funds. Actuaries measure the costs of different strategies regarding the design and funding of pension plans. These strategies are influenced by many moving parts. They must consider short-term and long-term bond rates and changing workforce demographics. They also track economic trends and changes in the internal revenue code. When companies merge, actuaries help combine different pension plans on an equitable basis. This ensures that benefits for both current and future retirees are properly valued.

Beyond traditional finance, actuarial science is used in property and casualty insurance. These companies often specialize because risks are so diverse. Personal lines include coverage for fire, auto, and homeowners. Commercial lines address business needs like product liability and workers' compensation. Actuaries even help assess risks from catastrophic events like earthquakes or terrorism. In the field of reinsurance, they design arrangements to protect insurance companies from massive claims. They establish reserve funds to prepare for future catastrophes.

Some controversial applications of actuarial science exist in criminal justice. In certain U.S. states, actuarial models are used to set criminal sentencing guidelines. These models attempt to predict the chance of re-offending based on factors like age and education. Similarly, models like the Static-99 are used to assess the risk of sex offense recidivism. This helps determine if an individual should be institutionalized or released. However, these uses are often criticized. Some argue these models can provide justification for discrimination against specific ethnic groups.

Being an actuary is a highly regarded profession. In 2010, CareerCast ranked actuary as the number one job in the United States. This ranking was based on income, environment, stress, physical demands, and employment outlook. In 2024, U.S. News & World Report ranked the role as the third-best job in the business sector. It was also ranked as the eighth-best job in STEM. This highlights the growing importance of mathematical expertise in the global economy.