August 1995 | NTIA Technical Report TR-95-319-6

Performance Evaluation of Data Communication Services: NTIA Implementation of American National Standard x3.141, Volume 6. Data Display

Christopher A. Bogart; Darin R. Schwartz; Martin J. Miles; Robert S. Reichert; David R. Wortendyke

Abstract: The six volumes of this report are: Volume 1. Overview; Volume 2. Experiment Design; Volume 3. Data Extraction; Volume 4. Data Reduction; Volume 5. Data Analysis; Volume 6. Data Display This volume shows how to use software that draws graphs of the ANS X3.l02 primary delay performance parameters. The four types of two–dimensional graphs are histograms, box plots (i.e., abbreviated histograms), chronological plots, and regression lines. Histograms and box plots can represent data from either a single test or pooled data. from multiple tests; only one histogram can be drawn on a page, but several box plots can be drawn on one page. Chronological plots represent data from a single test; several plots can be drawn on a page. Regression plots fit lines to points, each of which is a trial or the estimate of the mean of a test. Because the values occur at different quantifiable levels, regression lines usually represent data from multiple tests; several regression plots can be drawn on a page. All system commands and routines are UNIX™ commands and shell scripts. The routines are intended to be used on the HP7475A vector plotter but can be used on other plotters if some routines are altered. Data for these routines usually come from the output of data reduction (Volume 4). Box plots, chronological plots, and regression plots use the general-purpose plotting packages called vp and vpz, which could be used for other graphs.

Keywords: data communication systems; box plots; chronological plots; histograms; HP7475A vector plotter; linear regression plots; primary delay performance parameters

To request a reprint of this report, contact:

Ed Drocella, Chief,
Spectrum Engineering and Analysis Division
Office of Spectrum Management
National Telecommunications and Information Administration
(202) 482-1652

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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