venstreskjev
Venstreskjev, also called left-skewness or negative skew, describes a probability distribution with a longer left tail than the right tail. In such distributions, most observations cluster toward higher values, while a minority extend toward lower values. Consequently, the order of measures of central tendency tends to be mean < median < mode (when defined): the mean is pulled downward by the left tail, the median lies between, and the mode is typically at or near the peak on the right.
Identification: A histogram or density plot shows a longer tail to the left. The skewness coefficient, such
Examples: An easy exam can yield a left-skewed score distribution, with many students scoring high and a
Implications: Skewness affects the interpretation of the mean as a measure of central tendency and can influence