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CURVE CHART

The curve or line chart is probably the most widely used form of graphic presentation. It is very simple to construct presentation. It is very simple to construct and is most effective when the emphasis is on movement, rather than amount. The curve chart is normally used for data covering a long period of time. It is also possible to compare two or more series on the same chart. The curve or line chart may be used to show trends in various enforcement activities, such as total AWOLs, vehicle registrations, offenses, apprehensions, and so forth.

VERTICAL BAR CHART

Another chart frequently used to depict enforcement data is the vertical bar or column chart. This chart is also used to depict numerical values of a given item over a period of time. It may be used for months of the year, as shown, for days of the week, for hours of the day, or for all three. The chart is simple to construct and readily understood. The vertical bar chart is preferable to the curve chart when a sharper delineation of trend is to be shown.

HORIZONTAL BAR CHART

The horizontal bar chart is the simplest form of graph. Its primary use is to compare different items as of a specified date. In MP work, the horizontal bar chart is used to break down offenses by units, traffic violations by specific violation over a given period and for a specified date, and similar categories.

CIRCLE GRAPH OR PIE (SECTOR) CHART

The circle graph or pie (sector) chart compares various components with each other and with the whole. This chart serves to direct attention to extreme areas. The primary disadvantage of the pie chart is that where many segments are involved the chart will appear confusing. The small sections of the chart will be difficult to label in such a case. A bar chart is recommended when dealing with numerous components.

PIN MAP

The pin map is another way of graphically presenting data pertaining to frequency, type, and location of accidents or incidents. This chart is also considered to be an essential element of selective enforcement planning, A map of an area is mounted on a board capable of holding pins. Locations of accidents or incidents are indicated by pins stuck into the map at the location where the incidents or accidents occurred. Different types of accidents or incidents (that is, injury, fatality) may be depicted by different colored or marked pins. The pin map may be used as a yearly record and, if photographed, may be compared with succeeding years.