The average value of a squared sine function is simply half the square of the maximum amplitude so. Notice that for frequencies of less than 01 the largest value in the Periodogram column occurs at a frequency of 008333precisely what you expect to find if there is an annual periodic component. Count the number of data points.
Below is a frequency distribution table representing number of students absent in every grade.
To calculate the frequency density we use the formula. When class widths are not equal frequency density becomes the vertical axes. If numerical values are not entered for any quantity it will default to a string of 100 cm length tuned to 440 Hz. A histogram is drawn like a bar chart but often has bars of unequal width.