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A Pareto chart is a graph that shows the frequency or cost of different factors in descending order, based on the Pareto principle. It is used to identify the most important or frequent causes of defects, complaints, or problems in quality control.
Learn what a percentile is, how it is calculated and used in statistics, and how different methods can yield different results. Compare exclusive and inclusive definitions, nearest-rank and interpolation methods, and see illustrations and tables.
A percentage is a number or ratio expressed as a fraction of 100, often denoted by the percent sign (%). Learn how to compute percentages, their history, and how to use them to compare proportions, changes, and rates.
Learn how to calculate and interpret percentile rank, a statistic that shows the percentage of scores in a distribution that are less than a given score. Find out the usage, caveats and examples of percentile rank in education and test measurement.
In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.
A histogram is a visual representation of the distribution of quantitative data, constructed by dividing the range of values into intervals and counting how many values fall into each interval. Learn how to read, interpret and compare histograms, and see examples of different types of histograms.
Fold change is a measure of how much a quantity changes between two measurements, defined as the ratio of the two values. It is often used in gene expression analysis, but has limitations and biases due to the logarithmic scale and the denominator.
A radar chart is a graphical method of displaying multivariate data in the form of a two-dimensional chart of three or more quantitative variables. It is equivalent to a parallel coordinates plot, with the axes arranged radially, and has various applications in sports, quality improvement, and life sciences.
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