Joint Probability

AAA

DEFINITION of 'Joint Probability'

A statistical measure where the likelihood of two events occurring together and at the same point in time are calculated. Joint probability is the probability of event Y occurring at the same time event X occurs.

Notation for joint probability takes the form:

Joint Probability

BREAKING DOWN 'Joint Probability'

Joint probability is a measure of two events happening at the same time, and can only be applied to situations where more than one observation can be occurred at the same time.

For example, a joint probability can not be calculated when tossing a coin on the same flip. However, the joint probability can be calculated on the probability of rolling a 2 and a 5 using two different dice.

RELATED TERMS
  1. Sampling Error

    A statistical error to which an analyst exposes a model simply ...
  2. Statistics

    A type of mathematical analysis involving the use of quantified ...
  3. Probability Distribution

    A statistical function that describes all the possible values ...
  4. Non-Sampling Error

    A statistical error caused by human error to which a specific ...
  5. Conditional Probability

    Probability of an event or outcome based on the occurrence of ...
  6. Compound Annual Growth Rate - CAGR

    The Compound Annual Growth Rate (CAGR) is the mean annual growth ...
Related Articles
  1. Options & Futures

    An Introduction To Value at Risk (VAR)

    Volatility is not the only way to measure risk. Learn about the "new science of risk management".
  2. Fundamental Analysis

    Find The Right Fit With Probability Distributions

    Discover a few of the most popular probability distributions and how to calculate them.
  3. Active Trading Fundamentals

    Bet Smarter With The Monte Carlo Simulation

    This technique can reduce uncertainty in estimating future outcomes.
  4. Active Trading Fundamentals

    How To Convert Value At Risk To Different Time Periods

    Volatility is not the only way to measure risk. Learn about the "new science of risk management".
  5. Economics

    The Problem With Today’s Headline Economic Data

    Headwinds have kept the U.S. growth more moderate than in the past–including leverage levels and an aging population—and the latest GDP revisions prove it.
  6. Economics

    Explaining the Participation Rate

    The participation rate is the percentage of civilians who are either employed or unemployed and looking for a job.
  7. Mutual Funds & ETFs

    ETF Analysis: Guggenheim Enhanced Short Dur

    Find out about the Guggenheim Enhanced Short Duration ETF, and learn detailed information about this fund that focuses on fixed-income securities.
  8. Mutual Funds & ETFs

    ETF Analysis: iShares Morningstar Small-Cap Value

    Find out about the Shares Morningstar Small-Cap Value ETF, and learn detailed information about this exchange-traded fund that focuses on small-cap equities.
  9. Mutual Funds & ETFs

    ETF Analysis: iShares MSCI KLD 400 Social

    Find out about the iShares MSCI KLD 400 Social exchange-traded fund, and learn detailed information about its characteristics, suitability and recommendations.
  10. Mutual Funds & ETFs

    ETF Analysis: iShares Agency Bond

    Find out about the iShares Agency Bond exchange-traded fund, and explore detailed analysis of the ETF that tracks U.S. government agency securities.
RELATED FAQS
  1. What assumptions are made when conducting a t-test?

    The common assumptions made when doing a t-test include those regarding the scale of measurement, random sampling, normality ... Read Full Answer >>
  2. What are some of the more common types of regressions investors can use?

    The most common types of regression an investor can use are linear regressions and multiple linear regressions. Regressions ... Read Full Answer >>
  3. What types of assets lower portfolio variance?

    Assets that have a negative correlation with each other reduce portfolio variance. Variance is one measure of the volatility ... Read Full Answer >>
  4. When is it better to use systematic over simple random sampling?

    Under simple random sampling, a sample of items is chosen randomly from a population, and each item has an equal probability ... Read Full Answer >>
  5. What are some common financial sampling methods?

    There are two areas in finance where sampling is very important: hypothesis testing and auditing. The type of sampling methods ... Read Full Answer >>
  6. How can I measure portfolio variance?

    Portfolio variance measures the dispersion of returns of a portfolio. It is calculated using the standard deviation of each ... Read Full Answer >>

You May Also Like

Hot Definitions
  1. Election Period

    The period of time during which an investor who owns an extendable or retractable bond must indicate to the issuer whether ...
  2. Shanghai Stock Exchange

    The largest stock exchange in mainland China, the Shanghai Stock Exchange is a nonprofit organization run by the China Securities ...
  3. Dead Cat Bounce

    A temporary recovery from a prolonged decline or bear market, followed by the continuation of the downtrend. A dead cat bounce ...
  4. Bear Market

    A market condition in which the prices of securities are falling, and widespread pessimism causes the negative sentiment ...
  5. Alligator Spread

    An unprofitable spread that occurs as a result of large commissions charged on the transaction, regardless of favorable market ...
  6. Tiger Cub Economies

    The four Southeast Asian economies of Indonesia, Malaysia, the Philippines and Thailand. Tiger cub economy indicates that ...
Trading Center
×

You are using adblocking software

Want access to all of Investopedia? Add us to your “whitelist”
so you'll never miss a feature!