Statistics

Statistics

1. The practice or science of collecting and analyzing numerical data in large quantities, especially for the purpose of inferring proportions in a whole from those in a representative sample.

   • Median
     • The median is a simple measure of central tendency. To find the median, we arrange the observations in order from smallest to largest value. If there is an odd number of observations, the median is the middle value. If there is an even number of observations, the median is the average of the two middle values.
   • Mode
     • The mode of a set of data values is the value that appears most often. If X is a discrete random variable, the mode is the value x (i.e, X = x) at which the probability mass function takes its maximum value. In other words, it is the value that is most likely to be sampled.
   • Mean
     • Statistical mean is a certain kind of mathematical average that's very useful in computer science, and in machine learning in particular. Simply speaking, the statistical mean is an arithmetic mean process, in that it adds up all numbers in a data set, and then divides the total by the number of data points.
   • Range
     • In statistics, the range is a measure of spread: it’s the difference between the highest value and the lowest value in a data set.