Population Profile Graph

http://www.ifad.org/operations/regional/pf/aids_1.htm

A population profile is simply a graph which depicts an average, or set age.  Extending bars to the left and right of this preset value show the population value of people in this age group.  Above is an example of a population profile of age groups and numbers of people with and without aids.

Index Value Plot

http://waterwatch.usgs.gov/new/?m=pa07d_dry&w=plot

Index value plots graph data on an X and Y axis.  The information is displayed in a linear form, where a trendline or expected value line can or may not be met.  This graph shows the expected rain for the time period shown, versus the actual recorded rain.

Univariate

http://indiemapper.com/app/learnmore.php?l=bivariate_choropleth
Univariate maps display one variable of information, unlike bivariate maps.  Univariate maps are often a type of choropleth map.  This map is an example of of a univariate map.

Bivariate Map

http://reidarthur.ca/portfolio/

Bivariate maps are used to compare two different things or variables.  In this bivariate map, is shows the comparison between crime and population rise.

Unclassed choropleth

http://garrisonsmapcatalog.blogspot.com/2011/11/unclassed-choropleth-map.html

Unclassified choropleth maps do not take an average value or "round" to a dominating factor.  The scale for unclassed choropleth maps is gradual, allowing every shade of a color spectrum to have its own value.

Histogram

http://www.spcforexcel.com/histograms

A histogram is basically a bar graph.  A histogram has a set of bars, each representing their own piece of data.  There is an X axis and a Y axis.  On the Y axis, the numerical value of the data is represented, while on the x axis the object being analyzed is placed.  The histogram above represents a graph comparing frequency vs. measurement length.

Box plot

http://home.centurytel.net/~mjm/boxplotanatomy.htm

Box plots depict numerical data through sets of quartile blocks.  Above shows a breakdown of how to read and interpret a box plot