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  2. Aggregate function - Wikipedia

    en.wikipedia.org/wiki/Aggregate_function

    Average (i.e., arithmetic mean) Count; Maximum; Median; Minimum; Mode; Range; Sum; Others include: Nanmean (mean ignoring NaN values, also known as "nil" or "null") Stddev; Formally, an aggregate function takes as input a set, a multiset (bag), or a list from some input domain I and outputs an element of an output domain O. [1]

  3. Weighted arithmetic mean - Wikipedia

    en.wikipedia.org/wiki/Weighted_arithmetic_mean

    However, this does not account for the difference in number of students in each class (20 versus 30); hence the value of 85 does not reflect the average student grade (independent of class). The average student grade can be obtained by averaging all the grades, without regard to classes (add all the grades up and divide by the total number of ...

  4. Arithmetic mean - Wikipedia

    en.wikipedia.org/wiki/Arithmetic_mean

    A weighted average, or weighted mean, is an average in which some data points count more heavily than others in that they are given more weight in the calculation. [6] For example, the arithmetic mean of 3 {\displaystyle 3} and 5 {\displaystyle 5} is 3 + 5 2 = 4 {\displaystyle {\frac {3+5}{2}}=4} , or equivalently 3 ⋅ 1 2 + 5 ⋅ 1 2 = 4 ...

  5. Winsorizing - Wikipedia

    en.wikipedia.org/wiki/Winsorizing

    For instance, the 10% trimmed mean is the average of the 5th to 95th percentile of the data, while the 90% winsorized mean sets the bottom 5% to the 5th percentile, the top 5% to the 95th percentile, and then averages the data. Winsorizing thus does not change the total number of values in the data set, N.

  6. Slope One - Wikipedia

    en.wikipedia.org/wiki/Slope_One

    If a user rated several items, the predictions are simply combined using a weighted average where a good choice for the weight is the number of users having rated both items. In the above example, both John and Mark rated items A and B, hence weight of 2 and only John rated both items A and C, hence weight of 1 as shown below. we would predict ...

  7. Dad says daughter was called 'this': Angry parents protest ...

    www.aol.com/demonstrators-protest-maryland...

    The students attend Dr. James Craik Elementary School and belong to the district's ACHIEVE program, for students with "significant cognitive disabilities" and SOAR program, for students with autism.

  8. A stowaway on a flight to Paris was released from US federal ...

    www.aol.com/stowaway-flight-paris-faces-court...

    A woman who stowed away on a Delta flight from New York to Paris last week has been released from custody after being charged in federal court, but with more than a dozen conditions.

  9. Reduced chi-squared statistic - Wikipedia

    en.wikipedia.org/wiki/Reduced_chi-squared_statistic

    The degree of freedom, =, equals the number of observations n minus the number of fitted parameters m. In weighted least squares , the definition is often written in matrix notation as χ ν 2 = r T W r ν , {\displaystyle \chi _{\nu }^{2}={\frac {r^{\mathrm {T} }Wr}{\nu }},} where r is the vector of residuals, and W is the weight matrix, the ...