Statistics: Graphs and Pictograms
Date: 6/6/96 at 10:54:10 From: Anonymous Subject: Statistics: Graphs In statistics, what makes a graph a pictogram? I have tried looking up the index of some books on the Internet, a dictionary, and also searching for "pictogram" on NetSearch. I also looked around this site - including the On-Line Mathematics Dictionary, but they aren't very clear. A particular problem is a graph in one book where some planes are set out like a bar graph. The planes are shown one after another with their tails at the left hand axis. The longer (and larger) planes are for the companies with the most deliveries. There are two views. One says that they are just a wierd kind of bar graph and not a pictogram. They other says that they are pictograms, but they are bad statistics. (They are poor because the data are represented by the LENGTH of the plane, but the AREAS of the larger planes convey an impression that they are much larger.)
Date: 6/30/96 at 15:57:23 From: Doctor Robert Subject: Re: Statistics: Graphs I suppose that there are many ways to define a pictogram, but in its simplest form it means a type of bar graph where the NUMBER of images indicates the length of the bar. Usually, there should be some type of key so that one can get numerical data from the pictogram. Personally I think that a standard bar graph will convey the data with more clarity, less confusion. I agree with you that if the length of a plane represents a number, that would be confusing. I would rather see each plane represent a certain number of deliveries rather than the length of the plane represent a certain number of deliveries. Good luck! -Doctor Robert, The Math Forum Check out our web site! http://mathforum.org/dr.math/
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