DEFINITION of 'Frequency Of Exclusion '

Frequency of exclusion refers to the rate of occurrence of a given group being excluded from a sample or study. The frequency of exclusion defines the percentage or rate that a specified group is underrepresented in a sample or study.

BREAKING DOWN 'Frequency Of Exclusion '

Statistics is a type of mathematical study that aims to gather, review and analyze data to draw conclusions about a population, whether that population is a group of things, people, animals or anything else with common characteristics that a statistician seeks to understand. Because the population being studied can be very large, such as the human race or the population of evergreen trees on the planet, collecting and analyzing data on the entire group may be infeasible.

Statisticians instead select a representative subset or sample of the entire population in these cases. A sample is a smaller, more manageable version of the entire population. The determination of samples should ideally be unbiased, but statisticians may leave out given members of the entire population being studied, either intentionally or inadvertently. Frequency of exclusion can be determined for these population members, and can indicate if those members are categorically overlooked in a statistical study.

Why Frequency of Exclusion Matters

Statistical study results lose their meaningfulness if certain members of the population have a high frequency of exclusion from the sample because the results will not accurately represent the entire population of interest. For example, one could determine the rate at which persons with a certain blood type are excluded from a particular medical study on a promising new pharmaceutical drug. If for instance, the study excluded type B positive blood types, the frequency of exclusion for type B positive blood would be 100%, and the study results will not accurately reflect the effects of the tested drug that may occur when taken by the general public, a portion of whom have type B positive blood.

Because an important and relevant member group of the population was excluded from the study, the results lack statistical significance. Conversely, if a statistician excluded a member grouping because it represents a statistically insignificant amount of the entire population, such as excluding the evergreen trees in Hawaii in a study of evergreens on the planet, although the frequency of exclusion is 100% for the group of evergreens in Hawaii, the statistical significance of the study should be unaffected.

  1. Population

    Population is the entire pool from which a statistical sample ...
  2. Representative Sample

    A representative sample is a subset of a statistical population ...
  3. Sampling Distribution

    A sampling distribution is a probability distribution of a statistic ...
  4. Sampling

    Sampling is a process used in statistical analysis in which a ...
  5. Simple Random Sample

    A simple random sample is a subset of a statistical population ...
  6. Sampling Error

    A sampling error is a statistical error that occurs when an analyst ...
Related Articles
  1. Investing

    How to Use Stratified Random Sampling

    Stratified random sampling is a technique best used with a sample population easily broken into distinct subgroups. Samples are then taken from each subgroup based on the ratio of the subgroup’s ...
  2. Personal Finance

    The Key To CFP Exam Success

    Up to 60 of the questions on CFP exam are case studies. Are you up for the challenge?
  3. Insights

    These Companies Are Poised for Growth as Global Population Growth Comes Online

    While there are many concerns about population growth putting pressure on natural resources such as water and energy, these increased demands can spell profits for certain companies that can ...
  4. Investing

    Hypothesis testing in finance: Concept and examples

    When you're indecisive about an investment, the best way to keep a cool head might be test various hypotheses using the most relevant statistics.
  5. Trading

    Trading Multiple Time Frames In FX

    This is often the first - and most costly - level of analysis to be overlooked.
  6. Personal Finance

    How Much Will It Cost To Study Abroad In The U.K.?

    The most popular destination for U.S. students studying abroad has a lot to offer – and ways to make it affordable.
  7. Personal Finance

    Birch Box Review: Is It Worth It?

    Learn more about the subscription beauty box industry, and discover why the Birchbox company, in particular, has become so popular.
  8. Investing

    It's No Accident That Drugs Are Expensive

    Branded drugs are expensive in large part because it's expensive and risky to develop them
  9. Financial Advisor

    Keep an Eye on These Emerging Economies

    Emerging markets have been hammered lately, but these three countries (and their large and young populations) are worth monitoring.
  1. What percentage of the population do you need in a representative sample?

    Learn about representative samples and how they are used in conjunction with other strategies to create useful data with ... Read Answer >>
  2. What are the advantages of using a simple random sample to study a larger population?

    Learn how simple random sampling works and what advantages it offers over other sampling methods when selecting a research ... Read Answer >>
  3. What's an example of stratified random sampling?

    Stratified random sampling divides a population into subgroups or strata, whereby the members in each of the stratum formed ... Read Answer >>
  4. What Is an Evergreen Provision?

    An evergreen provision grants equity allotments to certain employees on a regular basis. Read Answer >>
Trading Center