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  2. IQ imbalance - Wikipedia

    en.wikipedia.org/wiki/IQ_imbalance

    IQ imbalance is a performance-limiting issue in the design of a class of radio receivers known as direct conversion receivers. [a] These translate the received radio frequency (RF, or pass-band) signal directly from the carrier frequency to baseband using a single mixing stage.

  3. Carrier frequency offset - Wikipedia

    en.wikipedia.org/wiki/Carrier_frequency_offset

    In order to estimate this additional integer CFO, a matched filter matching the fractional CFO-compensated received signal against the modulated long preamble waveforms can be used. The coefficients of the matched filter are the complex conjugate of the long preamble and they are modulated by a sinusoidal wave whose frequency is a possible ...

  4. Floor effect - Wikipedia

    en.wikipedia.org/wiki/Floor_effect

    An IQ test designed to help assess intellectually disabled persons might intentionally be designed with easier item content and a lower floor score to better distinguish among individuals taking the test as part of an assessment process.

  5. Estimation statistics - Wikipedia

    en.wikipedia.org/wiki/Estimation_statistics

    [2] [3] Estimation statistics is sometimes referred to as the new statistics. [3] [4] [5] The primary aim of estimation methods is to report an effect size (a point estimate) along with its confidence interval, the latter of which is related to the precision of the estimate. [6]

  6. Rasch model - Wikipedia

    en.wikipedia.org/wiki/Rasch_model

    The Rasch model, named after Georg Rasch, is a psychometric model for analyzing categorical data, such as answers to questions on a reading assessment or questionnaire responses, as a function of the trade-off between the respondent's abilities, attitudes, or personality traits, and the item difficulty.

  7. Structural equation modeling - Wikipedia

    en.wikipedia.org/wiki/Structural_equation_modeling

    (The estimation process minimizes the differences between the model and data but important and informative differences may remain.) Research claiming to test or "investigate" a theory requires attending to beyond-chance model-data inconsistency. Estimation adjusts the model's free coefficients to provide the best possible fit to the data.

  8. Evaluation measures (information retrieval) - Wikipedia

    en.wikipedia.org/wiki/Evaluation_measures...

    Indexing and classification methods to assist with information retrieval have a long history dating back to the earliest libraries and collections however systematic evaluation of their effectiveness began in earnest in the 1950s with the rapid expansion in research production across military, government and education and the introduction of computerised catalogues.

  9. Dunning–Kruger effect - Wikipedia

    en.wikipedia.org/wiki/Dunning–Kruger_effect

    Simulated data of the relation between subjective (self-assessed) and objective IQ. The upper diagram shows the individual data points and the lower one shows the averages of the different IQ groups. This simulation is based only on the statistical effect known as the regression toward the mean together with the better-than-average effect ...