what is dow jones industrial average (djia)
Dow Jones Industrial Average The Dow Jones Industrial Average (DJIA), or simply the Dow (/ˈdaʊ/), is a stock market index that shows how 30 large, publicly owned companies based in the United States have traded during a standard trading session in the stock market.[3] The value of the Dow is not a weighted arithmetic mean[4] and does not represent its component companies' market capitalization, but rather the sum of the price of one share of stock for each component company. The sum is corrected by a factor which changes whenever one of the component stocks has a stock split or stock dividend, so as to generate a consistent value for the index.[5]
Interquartile range In descriptive statistics, the interquartile range (IQR), also called the midspread or middle 50%, or technically H-spread, is a measure of statistical dispersion, being equal to the difference between 75th and 25th percentiles, or between upper and lower quartiles,[1][2] IQR = Q3 −  Q1. In other words, the IQR is the first quartile subtracted from the third quartile; these quartiles can be clearly seen on a box plot on the data. It is a trimmed estimator, defined as the 25% trimmed range, and is the most significant basic robust measure of scale.