Dataset

The Statistical Abstract files are distributed by the US Census Department as Microsoft Excel files. These files have data mixed with notes and references, multiple tables per sheet, and, worst of all, the table headers are not easily matched to their rows and columns.

A few files had extraneous characters in the title. These were corrected to be consistent. A few files have a sheet of crufty gibberish in the first slot. The sheet order was shuffled but no data were changed.

The tables that were changed (this is table 1120):

0166 0257 0362 0429 0445 0446 0459 0461 0462 0464 0465 0466 0467
0469 0479 0480 0481 0482 0483 0484 0485 0486 0487 0559 0628 0629
1144 1227 1231

This dataset consists of a table of 15 rows and 10 columns.

Calendar year data, except as noted (5,283 represents 5,283,000). Based on a survey sent to all facilities-based cellular, personal communications services, and enhanced special mobile radio (ESMR) service providers. For 2006, companies serving 96.9 percent of customers responded. The number of operational systems beginning 2000 differs from that reported for previous periods as a result of the consolidated operation of ESMR systems in a broader service area instead of by a city-to-city basis

Footnotes

1. The basic geographic unit of a wireless PCS or cellular system. A city or county is
   divided into smaller “cells,” each of which is equipped with a
   low-powered radio transmitter/receiver. The cells can vary in size depending
   upon terrain, capacity demands, etc. By controlling the transmission
   power, the radio frequencies assigned to one cell can be limited to the
   boundaries of that cell. When a wireless PCS or cellular phone moves from one cell
   toward another, a computer at the Switching Office monitors the movement
   and at the proper time, transfers or hands off the phone call to the new
   cell and another radio frequency.
2. Service revenue generated by subscribers’ calls outside of their
   system areas.
3. Beginning 2005, cumulative capital investment figure reached by summing the incremental
   capital investment in year shown with cumulative capital investment of prior year.
4. As of December 31.