What is the difference between outlier and inlier?

Answer 1

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inlier, outlier The terms 'inlier' and 'outlier' each describe a situation where a outcrop of one type of rock appears at the surface completely surrounded by another. This is usually a result of erosion having removed part of an overlying rock unit from an underlying unit. An inlier is then an isolated region of underlying rock exposed by erosion of the overlying units, whereas an outlier is an isolated remnant of overlying rock that has survived the erosion that has stripped it away everywhere else to reveal the underlying rocks. In regions of flat-lying or gently dipping strata, inliers tend to occur in valley bottoms whereas the hilltops may be occupied by outliers. Where the strata have been strongly folded prior to erosion these simple topographic relationships do not necessarily apply, and it is possible to have an inlier preserved in the core of an anticline occupying high ground or an outlier preserved in the core of a syncline occupying low ground. Inliers and outliers can also be generated by fault move-ments followed by erosion. For example, if an older unit is thrust over a younger unit erosion can isolate part of the thrust sheet, leaving an outlier of older rock surrounded by younger rock (a reversal of the usual age relation-ship). Similarly erosion can expose a window through the thrust sheet to reveal an inlier of younger rock surrounded by older rock. Fault movements by which blocks of terrain move up or down relative to each other, as when horsts or grabens are formed, can also produce inliers and outliers.

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Answer 2

An outlier is a data point that significantly differs from other observations in a dataset, while an inlier is a data point that is consistent with the majority of observations. Outliers can skew statistical analyses and models, while inliers are used to represent the general trend or pattern in the data. Identifying outliers and handling them appropriately is important in data analysis.