Sample

Definition of 'Sample'


A subset containing the characteristics of a larger population. Samples are used in statistical testing when population sizes are too large for the test to include all possible members or observations. A sample should represent the whole population and not reflect bias toward a specific attribute.

Investopedia explains 'Sample'


A sample is a smaller, manageable version of a larger group. For example, if you wanted to test an investment strategy on past stock data, you would have an enormous number of stocks to test. Instead of testing the strategy on every stock, you would use a sample, which allows you to draw statistical insights from a smaller group of stocks. The sample should not contain any bias, such as the survivorship bias, where you might only use stocks that have survived the entire length of time you wish to test. Choosing a sample randomly should eliminate the possibilities of bias.


Filed Under:

comments powered by Disqus
Hot Definitions
  1. Walras' Law

    An economics law that suggests that the existence of excess supply in one market must be matched by excess demand in another market so that it balances out. So when examining a specific market, if all other markets are in equilibrium, Walras' Law asserts that the examined market is also in equilibrium.
  2. Market Segmentation

    A marketing term referring to the aggregating of prospective buyers into groups (segments) that have common needs and will respond similarly to a marketing action. Market segmentation enables companies to target different categories of consumers who perceive the full value of certain products and services differently from one another.
  3. Effective Annual Interest Rate

    An investment's annual rate of interest when compounding occurs more often than once a year. Calculated as the following:
  4. Debit Spread

    Two options with different market prices that an investor trades on the same underlying security. The higher priced option is purchased and the lower premium option is sold - both at the same time. The higher the debit spread, the greater the initial cash outflow the investor will incur on the transaction.
  5. Odious Debt

    Money borrowed by one country from another country and then misappropriated by national rulers. A nation's debt becomes odious debt when government leaders use borrowed funds in ways that don't benefit or even oppress citizens. Some legal scholars argue that successor governments should not be held accountable for odious debt incurred by earlier regimes, but there is no consensus on how odious debt should actually be treated.
  6. Takeover

    A corporate action where an acquiring company makes a bid for an acquiree. If the target company is publicly traded, the acquiring company will make an offer for the outstanding shares.
Trading Center