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  2. Dummy data - Wikipedia

    en.wikipedia.org/wiki/Dummy_data

    Dummy data can be used as a placeholder for both testing and operational purposes. For testing, dummy data can also be used as stubs or pad to avoid software testing issues by ensuring that all variables and data fields are occupied. In operational use, dummy data may be transmitted for OPSEC purposes. Dummy data must be rigorously evaluated ...

  3. Dummy variable (statistics) - Wikipedia

    en.wikipedia.org/wiki/Dummy_variable_(statistics)

    In the panel data fixed effects estimator dummies are created for each of the units in cross-sectional data (e.g. firms or countries) or periods in a pooled time-series. However in such regressions either the constant term has to be removed, or one of the dummies removed making this the base category against which the others are assessed, for ...

  4. Star schema - Wikipedia

    en.wikipedia.org/wiki/Star_schema

    Employee dimension tables describe employees, such as sales people Range dimension tables describe ranges of time, dollar values or other measurable quantities to simplify reporting Dimension tables are generally assigned a surrogate primary key , usually a single-column integer data type, mapped to the combination of dimension attributes that ...

  5. Categorical variable - Wikipedia

    en.wikipedia.org/wiki/Categorical_variable

    Dummy coding is used when there is a control or comparison group in mind. One is therefore analyzing the data of one group in relation to the comparison group: a represents the mean of the control group and b is the difference between the mean of the experimental group and the mean of the control group. It is suggested that three criteria be ...

  6. Data analysis - Wikipedia

    en.wikipedia.org/wiki/Data_analysis

    Data collection or data gathering is the process of gathering and measuring information on targeted variables in an established system, which then enables one to answer relevant questions and evaluate outcomes. The data may also be collected from sensors in the environment, including traffic cameras, satellites, recording devices, etc.

  7. Dummy variable - Wikipedia

    en.wikipedia.org/wiki/Dummy_variable

    The term dummy variable can refer to either of the following: Bound variable, in mathematics and computer science, a placeholder variable;

  8. Fact table - Wikipedia

    en.wikipedia.org/wiki/Fact_table

    A transactional table is the most basic and fundamental. The grain associated with a transactional fact table is usually specified as "one row per line in a transaction", e.g., every line on a receipt. Typically a transactional fact table holds data of the most detailed level, causing it to have a great number of dimensions associated with it.

  9. Tickler file - Wikipedia

    en.wikipedia.org/wiki/Tickler_file

    A simple tickler file may use any number of folders. A tickler file or 43 Folders System is a collection of date-labeled file folders organized in a way that allows time-sensitive documents to be filed according to the future date on which each document needs action.