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  2. V-optimal histograms - Wikipedia

    en.wikipedia.org/wiki/V-optimal_histograms

    A v-optimal histogram is based on the concept of minimizing a quantity which is called the weighted variance in this context. [1] This is defined as = =, where the histogram consists of J bins or buckets, n j is the number of items contained in the jth bin and where V j is the variance between the values associated with the items in the jth bin.

  3. Histogram - Wikipedia

    en.wikipedia.org/wiki/Histogram

    Sturges's formula implicitly bases bin sizes on the range of the data, and can perform poorly if n < 30, because the number of bins will be small—less than seven—and unlikely to show trends in the data well. On the other extreme, Sturges's formula may overestimate bin width for very large datasets, resulting in oversmoothed histograms. [14]

  4. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    Horses are used to measure distances in horse racing – a horse length (shortened to merely a length when the context makes it obvious) equals roughly 8 feet or 2.4 metres. Shorter distances are measured in fractions of a horse length; also common are measurements of a full or fraction of a head, a neck, or a nose. [10]

  5. Toddler bed - Wikipedia

    en.wikipedia.org/wiki/Toddler_bed

    A toddler bed is low to the ground to facilitate safe and easy entry and exit for the occupant. Due to their ground height, they are often referred to as floor beds or montessori beds. [1] The mattress in a toddler bed is often the same size as that in an infant bed. Generally toddler beds range from 70 centimetres (28 in) x 140 centimetres (55 ...

  6. Bed size - Wikipedia

    en.wikipedia.org/wiki/Bed_size

    In practice, bed sizes are usually categorized by the width. The length is typically 200 cm (79 in), but this may vary. The most common sizes are: [citation needed] 120 cm × 200 cm (47 in × 79 in) 150 cm × 200 cm (59 in × 79 in) 180 cm × 200 cm (71 in × 79 in) Other bed sizes are available, which are less common however.

  7. Length - Wikipedia

    en.wikipedia.org/wiki/Length

    Various terms for the length of a fixed object are used, and these include height, which is vertical length or vertical extent, width, breadth, and depth. Height is used when there is a base from which vertical measurements can be taken. Width and breadth usually refer to a shorter dimension than length. Depth is used for the measure of a third ...

  8. Infant bed - Wikipedia

    en.wikipedia.org/wiki/Infant_bed

    Although in the U.S. there is a standard size for an infant bed (~71 cm x ~133 cm), 12% of the 2.4 million infant beds sold annually are not of this size; "mini cribs" are an example of this. [4] The "mini crib" is an umbrella term that covers all cots smaller than the standard size. [ 14 ]

  9. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    Before the establishment of the decimal metric system in France during the French Revolution in the late 18th century, [4] many units of length were based on parts of the human body. [5] [6] The Nippur cubit was one of the oldest known units of length. The oldest known metal standard for length corresponds to this Sumerian unit and dates from ...

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