64 lines
2.1 KiB
Plaintext
64 lines
2.1 KiB
Plaintext
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{{alias}}( arr[, options] )
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Computes the sample ranks for the values of an array-like object.
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When all elements of the `array` are different, the ranks are uniquely
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determined. When there are equal elements (called *ties*), the `method`
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option determines how they are handled. The default, `'average'`, replaces
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the ranks of the ties by their mean. Other possible options are `'min'` and
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`'max'`, which replace the ranks of the ties by their minimum and maximum,
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respectively. `'dense'` works like `'min'`, with the difference that the
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next highest element after a tie is assigned the next smallest integer.
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Finally, `ordinal` gives each element in `arr` a distinct rank, according to
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the position they appear in.
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The `missing` option is used to specify how to handle missing data.
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By default, `NaN` or `null` are treated as missing values. `'last'`specifies
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that missing values are placed last, `'first'` that the are assigned the
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lowest ranks and `'remove'` means that they are removed from the array
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before the ranks are calculated.
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Parameters
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----------
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arr: Array<number>
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Input values.
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options: Object (optional)
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Function options.
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options.method (optional)
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Method name determining how ties are treated (`average`, `min`, `max`,
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`dense`, or `ordinal`). Default: `'average'`.
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options.missing (optional)
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Determines where missing values go (`first`, `last`, or `remove`).
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Default: `'last'`.
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options.encoding (optional)
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Array of values encoding missing values. Default: `[ null, NaN ]`.
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Returns
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-------
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out: Array
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Array containing the computed ranks for the elements of the input array.
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Examples
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--------
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> var arr = [ 1.1, 2.0, 3.5, 0.0, 2.4 ] ;
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> var out = {{alias}}( arr )
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[ 2, 3, 5, 1, 4 ]
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// Ties are averaged:
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> arr = [ 2, 2, 1, 4, 3 ];
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> out = {{alias}}( arr )
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[ 2.5, 2.5, 1, 5, 4 ]
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// Missing values are placed last:
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> arr = [ null, 2, 2, 1, 4, 3, NaN, NaN ];
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> out = {{alias}}( arr )
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[ 6, 2.5, 2.5, 1, 5, 4, 7 ,8 ]
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See Also
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--------
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