This is the sixth in a series of lecture notes which, if tied together into a textbook, might be entitled “Practical Regression.” The purpose of the notes is to supplement the theoretical content of ...

Mode Formula: Mode is a fundamental concept in statistics. It refers to the value or values that occur most frequently in a dataset. In other words, it's the number or numbers that appear with the ...

When data has been grouped, the mean value cannot be found exactly as the individual values in each class are not known. To find an approximate value for the mean from a grouped frequency table, the ...

Have you ever grouped data in Excel only to find your months sorted alphabetically instead of chronologically? It’s a frustrating quirk of the GROUPBY function, one that can turn a clean dataset into ...