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  2. Group by (SQL) - Wikipedia

    en.wikipedia.org/wiki/Group_by_(SQL)

    Typically, grouping is used to apply some sort of aggregate function for each group. [1] [2] The result of a query using a GROUP BY statement contains one row for each group. This implies constraints on the columns that can appear in the associated SELECT clause. As a general rule, the SELECT clause may only contain columns with a unique value ...

  3. Quartile coefficient of dispersion - Wikipedia

    en.wikipedia.org/wiki/Quartile_coefficient_of...

    Since it is based on quantile information, it is less sensitive to outliers than measures such as the coefficient of variation. As such, it is one of several robust measures of scale. The statistic is easily computed using the first (Q 1) and third (Q 3) quartiles for each data set. The quartile coefficient of dispersion is: [1]

  4. Quantile regression - Wikipedia

    en.wikipedia.org/wiki/Quantile_regression

    Quantile regression is a type of regression analysis used in statistics and econometrics. Whereas the method of least squares estimates the conditional mean of the response variable across values of the predictor variables, quantile regression estimates the conditional median (or other quantiles) of the response variable.

  5. Quantile function - Wikipedia

    en.wikipedia.org/wiki/Quantile_function

    Quantile functions are used in both statistical applications and Monte Carlo methods. The quantile function is one way of prescribing a probability distribution, and it is an alternative to the probability density function (pdf) or probability mass function, the cumulative distribution function (cdf) and the characteristic function.

  6. Quartile - Wikipedia

    en.wikipedia.org/wiki/Quartile

    The first quartile (Q 1) is defined as the 25th percentile where lowest 25% data is below this point. It is also known as the lower quartile. The second quartile (Q 2) is the median of a data set; thus 50% of the data lies below this point. The third quartile (Q 3) is the 75th percentile where

  7. Her son shot himself by accident with her gun. Should she be ...

    www.aol.com/her-son-shot-himself-accident...

    Startled awake, mom discovers her son is shot. As Givens snapped awake, her son Destin was screaming, his right hand bleeding. Givens’ .22-caliber Glock handgun lay on the floor nearby.

  8. College Football Playoff rankings: Ohio State slips, Miami ...

    www.aol.com/college-football-playoff-rankings...

    The schedule based on this week's rankings would look like this: First-round games (with seeding) No. 12 Arizona State at No. 5 Penn State. No. 11 Alabama at No. 6 Notre Dame.

  9. Q–Q plot - Wikipedia

    en.wikipedia.org/wiki/Q–Q_plot

    Q–Q plot for first opening/final closing dates of Washington State Route 20, versus a normal distribution. [5] Outliers are visible in the upper right corner. A Q–Q plot is a plot of the quantiles of two distributions against each other, or a plot based on estimates of the quantiles.