This chart looks much more useful but how was it generated? Well, we assigned each employee’s salary to a $25 interval ($800 - $825, $825 - $850 and so on). Since our bar chart wasn't any good, we now try and run a histogram on our data. Which renders this chart unsuitable for a metric variable such as monthly salary. But both are equally wide in millimeters on your screen. Importantly, note that the first interval is ($832 - $802 =) $30 wide. The main problem here is that a bar chart shows the frequency with which each distinct value occurs in the data. The only thing we learn from it is that most salaries occur just once and some twice.
We first try and run a bar chart of monthly salaries. Now how can we gain some insight into the salary distribution? Histogram Versus Bar Chart Since these salaries are partly based on commissions, basically every employee has a slightly different salary. The screenshot below shows what their raw data look like. Note that the mode of this frequency distribution is between $900 and $925, which occurs some 150 times.Ī company wants to know how monthly salaries are distributed over 1,110 employees having operational, middle or higher management level jobs. So it shows how many people make between $800 and $825, $825 and $850 and so on. The example above uses $25 as its bin width. Such intervals as known as “bins” and they all have the same widths. Intervals of values of a metric variable.
What Is a Histogram? By Ruben Geert van den Berg under Charts in SPSS & Statistics A-ZĪ histogram is a chart that shows frequencies for
0 kommentar(er)
