Libraries.Compute.Statistics.Calculations.StandardDeviation

This class calculates the Fisher-Pearson standardized moment coefficient, which is commonly used in statistical packages for the concept of skew. The equations used for it were pulled from: http://jse.amstat.org/v19n2/doane.pdf

Example Code

use Libraries.Compute.Statistics.DataFrame
    use Libraries.Compute.Statistics.Calculations.Skew

    //Load a comma separated file
    DataFrame frame
    frame:Load("Data.csv") 
    Kurtosis kurtosis
    DataFrameColumn column = frame:GetColumn(0)
    output column:Calculate(kurtosis)

If the calculation otherwise has no primitive type, it sends it to the column as a raw object. Columns might use this if they have custom types.

If the calculation returns true from IsIterable, this is an Integer object that was passed to the calculation. This may be undefined, which indicates that the column did not contain a value at this position in the column.

If the calculation returns true from IsIterable, this is a Boolean object that was passed to the calculation. This may be undefined, which indicates that the column did not contain a value at this position in the column.

If the calculation returns true from IsIterable, this is a Number object that was passed to the calculation. This may be undefined, which indicates that the column did not contain a value at this position in the column.

If the calculation returns true from IsIterable, this is a Text object that was passed to the calculation. This may be undefined, which indicates that the column did not contain a value at this position in the column.

This action can calculate the equation from a particular column. By default this action will only be called if the Calculation is not Iterable. Because the Column class is not guaranteed to have any particular data type, individual Calculation classes may need to cast to a particular column or data type to perform their operations. If a calculation is Iterable, the column will pass all of its data, one by one, to the calculation instead.

This action compares two object hash codes and returns an integer. The result is larger if this hash code is larger than the object passed as a parameter, smaller, or equal. In this case, -1 means smaller, 0 means equal, and 1 means larger. This action was changed in Quorum 7 to return an integer, instead of a CompareResult object, because the previous implementation was causing efficiency issues.

Example Code

Object o
        Object t
        integer result = o:Compare(t) //1 (larger), 0 (equal), or -1 (smaller)

This Calculation can be re-used if the Empty action is called before passing it to another column. Otherwise, it retains its data.

This action is called at the end of a calculation.

This action determines if two objects are equal based on their hash code values.

Example Code

use Libraries.Language.Object
        use Libraries.Language.Types.Text
        Object o
        Text t
        boolean result = o:Equals(t)

This action gets the hash code for an object.

Example Code

Object o
        integer hash = o:GetHashCode()

Returns the mean

This action returns the Kurtosis that was calculated.

This Calculation can be re-used if the Empty action is called before passing it to another column. Otherwise, it retains its data.

Sets the mean. The variance then uses this valus in its calculation.