# Analytical Tool

1564 Words7 Pages
Analytical tool An analytical tool is something used to analyze or "take a closer look at" something. It is normally a way to review the effectiveness of something. For example, Google offers a free web analytics tool that is used by Web Masters to track visitors on a given site. It allows Web Masters to see where visitors are coming from, how long they stay, what links they are reviewing, etc. Analytic Tool help with Tracking and Reports! Data flow diagram -A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system, modeling its process aspects. Often they are a preliminary step used to create an overview of the system which can later be elaborated.DFDs can also be used for the…show more content…
There are a wide variety of ways to illustrate frequency distributions, including histograms, relative frequency histograms, density histograms, and cumulative frequency distributions. Histograms show the frequency of elements that occur within a certain range of values, while cumulative distributions show the frequency of elements that occur below a certain value. Histograms Frequency Histogram 1. A graphical representation of a single dataset, tallied into classes. 2. Frequency defined as the number of values that fall into each class. 3. Histogram consists of a series of rectangles whose widths are defined by the limits of the classes, and whose heights are determined by the frequency in each interval. 4. Histogram depicts many attributes of the data, including location, spread, and symmetry. a. No rigid set of rules that determine the number of classes or class interval. b. Between 5 and 20 classes suitable for most datasets. c. Equal sized class widths are found by dividing the range by the number of classes. d. Formal guide by which class intervals can be derived is the formula: K = 1 + 3.3 * log n where K is the number of classes and n is the number of variables. 5. Relative frequency defined as the fraction of times the value occurs, or the freuqency of value(s) ÷ number of observations in the set. 6. Relative frequencies usually of more interest than