# Frequency distribution

distributionfrequency tabledistributionsfrequency tablesFrequency distribution § Joint frequency distributionsjoint frequencyjoint frequency distribution
In statistics, a frequency distribution is a list, table or graph that displays the frequency of various outcomes in a sample.wikipedia
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### Histogram

histogramsbin sizebin
It is a way of showing unorganized data notably to show results of an election, income of people for a certain region, sales of a product within a certain period, student loan amounts of graduates, etc. Some of the graphs that can be used with frequency distributions are histograms, line charts, bar charts and pie charts. The kurtosis of a frequency distribution is a measure of the proportion of extreme values (outliers), which appear at either end of the histogram.
A histogram is an accurate representation of the distribution of numerical data.

### Frequency (statistics)

frequencyrelative frequencyrelative frequencies
Each entry in the table contains the frequency or count of the occurrences of values within a particular group or interval.
The values of f_i for all events i can be plotted to produce a frequency distribution.

### Central tendency

LocalityLocality (statistics)Measure of central tendency
This assessment involves measures of central tendency or averages, such as the mean and median, and measures of variability or statistical dispersion, such as the standard deviation or variance.
A simple example of this is for the center of nominal data: instead of using the mode (the only single-valued "center"), one often uses the empirical measure (the frequency distribution divided by the sample size) as a "center".

### Contingency table

cross tabulationcontingency tablescrosstab
Bivariate joint frequency distributions are often presented as (two-way) contingency tables:
In statistics, a contingency table (also known as a cross tabulation or crosstab) is a type of table in a matrix format that displays the (multivariate) frequency distribution of the variables.

### Cumulative frequency analysis

cumulative frequencyCumFreqfrequency distributions
The presentation of all class frequencies gives a frequency distribution, or histogram.

### Count data

countcount type response variable datacounting statistics

### Statistics

statisticalstatistical analysisstatistician
In statistics, a frequency distribution is a list, table or graph that displays the frequency of various outcomes in a sample.

### Sampling (statistics)

samplingrandom samplesample
In statistics, a frequency distribution is a list, table or graph that displays the frequency of various outcomes in a sample.

### Variable (mathematics)

variablesvariableunknown
Here is an example of a univariate (single variable) frequency table.

### Line chart

lineline graphCentralograph
It is a way of showing unorganized data notably to show results of an election, income of people for a certain region, sales of a product within a certain period, student loan amounts of graduates, etc. Some of the graphs that can be used with frequency distributions are histograms, line charts, bar charts and pie charts.

### Bar chart

bar graphgraphicalgraphical timeline
It is a way of showing unorganized data notably to show results of an election, income of people for a certain region, sales of a product within a certain period, student loan amounts of graduates, etc. Some of the graphs that can be used with frequency distributions are histograms, line charts, bar charts and pie charts.

### Pie chart

polar area diagrampiesunburst chart
It is a way of showing unorganized data notably to show results of an election, income of people for a certain region, sales of a product within a certain period, student loan amounts of graduates, etc. Some of the graphs that can be used with frequency distributions are histograms, line charts, bar charts and pie charts.

### Marginal distribution

marginal probabilitymarginalmarginals
The total row and total column report the marginal frequencies or marginal distribution, while the body of the table reports the joint frequencies.

### Statistical hypothesis testing

hypothesis testingstatistical teststatistical tests
Statistical hypothesis testing is founded on the assessment of differences and similarities between frequency distributions.

### Average

Rushing averageReceiving averagemean
This assessment involves measures of central tendency or averages, such as the mean and median, and measures of variability or statistical dispersion, such as the standard deviation or variance.

### Mean

mean valueaveragepopulation mean
This assessment involves measures of central tendency or averages, such as the mean and median, and measures of variability or statistical dispersion, such as the standard deviation or variance.

### Median

averagesample medianmedian-unbiased estimator
This assessment involves measures of central tendency or averages, such as the mean and median, and measures of variability or statistical dispersion, such as the standard deviation or variance.

### Statistical dispersion

This assessment involves measures of central tendency or averages, such as the mean and median, and measures of variability or statistical dispersion, such as the standard deviation or variance.

### Standard deviation

standard deviationssample standard deviationSD
This assessment involves measures of central tendency or averages, such as the mean and median, and measures of variability or statistical dispersion, such as the standard deviation or variance.

### Variance

sample variancepopulation variancevariability
This assessment involves measures of central tendency or averages, such as the mean and median, and measures of variability or statistical dispersion, such as the standard deviation or variance.

### Skewness

skewedskewskewed distribution
A frequency distribution is said to be skewed when its mean and median are significantly different, or more generally when it is asymmetric.

### Symmetric probability distribution

symmetricsymmetric distributionSymmetry
A frequency distribution is said to be skewed when its mean and median are significantly different, or more generally when it is asymmetric.

### Kurtosis

excess kurtosisleptokurticplatykurtic
The kurtosis of a frequency distribution is a measure of the proportion of extreme values (outliers), which appear at either end of the histogram.

### Normal distribution

normally distributedGaussian distributionnormal
If the distribution is more outlier-prone than the Normal distribution it is said to be leptokurtic; if less outlier-prone it is said to be platykurtic.

### Letter frequency

letter frequenciesfrequently used charactersfrequently used letters
Letter frequency distributions are also used in frequency analysis to crack ciphers, and are used to compare the relative frequencies of letters in different languages and other languages are often used like Greek,Latin,etc.