Statistics - (Frequency|Rate)

Frequency is the number of times that a value appears in:

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Algorithm - Fast Fourier Transformation (FFT) (time to frequency and vice versa)

A fast Fourier transform (FFT) is an algorithm to compute the discrete Fourier transformdiscrete Fourier transform (DFT) and its inverse. time (or space) - of period P to frequency (or wavenumber)...
Computer Clock - Clock (Rate|Speed) - Hz

CPU's are marching forward at some frequency called the clock rate. It is also known as the clock speed. The clock rate is the speed at which a microprocessor executes instructions. Every computer...
Data Visualisation - Histogram (Frequency distribution)

A histogram is a type of graph generally used to visualize a distribution An histogram is also known as a frequency distribution. Histograms can reveal information not captured by summary statistics...
Frequency Distribution

A frequency distribution is a distribution of the frequency of each element ie the count of each element in a set or the count of each element in a period multiset
Statistics - (Data|Data Set) (Summary|Description) - Descriptive Statistics

Summary are a single value summarizing a array of data. They are: selected or calculated through reduction operations. They are an important element of descriptive analysis One of the most important...
Statistics - (Discretizing|binning) (bin)

Discretization is the process of transforming numeric variables into nominal variables called bin. The created variables are nominal but are ordered (which is a concept that you will not find in true...
Text Mining - term frequency – inverse document frequency (tf-idf)

tf–idf, short for term frequency–inverse document frequency, is a numerical statistic that is intended to reflect how important a word is to a document in a collection or corpus. It is often used...
Trigonometry - Fourier Transform

The Fourier transform decomposes a function of time (e.g., a periodic signal) into the frequencies that make it up, similarly to how a musical chord can be expressed as the amplitude (or loudness) of its...