Outlier definition is - a person whose residence and place of business are at a distance. Outlier. A data point that is distinctly separate from the rest of the data. One definition of outlier is any data point more than 1.5 interquartile ranges (IQRs) below the first quartile or above the third quartile.. EXAMPLE: Home; Outliers An outlier is a value in a data set that is very different from the other values. That is, outliers are values unusually far from the middle. An outlier is a number in a data set that is much smaller or larger than the other numbers in the data set. In statistics, an outlier is a data point that significantly differs from the other data points in a sample. An outlier is any value that is numerically distant from most of the other data points in a set of data. Do It Faster, Learn It Better. Said differently, low outliers shall lie below Q1-1.5 IQRand high outliers shall lie Q3+1.5IQR. Often, outliers in a data set can alert statisticians to experimental abnormalities or errors in the measurements taken, which may cause them to omit the outliers from the data set. In most cases, outliers have influence on mean , but not on the median , or mode . 90,86,15,86,92 15 would be an outlier in this data set. Definition of 'outlier' as used in statistics. If we subtract 1.5 x IQR from the first quartile, any data values that are less than this number are considered outliers. Outlier. The outlier formula is represented as follows, The Formula for Q1 = ¼ (n + 1) th term The Formula for Q3 = ¾ (n + 1) th term The Formula for Q2 = Q3 – Q1. Determining Outliers . home / study / math / statistics and probability / statistics and probability definitions / outlier Outlier If there are any extremely high or low values in the given data set when compared to other values then such values are termed as outliers. A value in a data set that lies far outside of a pattern they establish. An outlier is a number in a data set that is much smaller or larger than the other numbers in the data set. For example, the point on the far left in the above figure is an outlier. As you can see in the figure above, most of the data points cluster around the straight line fairly closely. One needs to calculate median, quartiles, including IQR, Q1, and Q3. Note: The IQR definition given here is widely used but is not the last word in determining whether a given number is an outlier. Multiplying the interquartile range (IQR) by 1.5 will give us a way to determine whether a certain value is an outlier. How to use outlier in a sentence. Transcript Welcome to MooMooMath where we upload a new Math video everyday. Measurement error, experiment error, and chance are common sources of outliers. Math Open Reference. Oo; outlier • a value far away from most of the rest in a set of data. Math Homework. Home Contact About Subject Index. Outliers are often easy to spot in histograms. 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