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2000 Statistical Abstract of the United States ix (2000)

handle is hein.usfed/statabs2000 and id is 1 raw text is: Example of Table Structure
No. 1090. Private Shipyards-Summary: 1980 to 2000
[For calendar year, unless noted. (178.0 represents 178,000)]
Item             Unit     1980    1985   1990    1995   1996    1997   1998    1999   2000
Employment 2              1,000     178.0   138.3  130.8   105.0  100.4    98.6  104.4    99.1    98.1
Production workers ...... 1000...  138.8  101.2   93.6    77.8   73.5    70.8   74.9    67.7    676
Building activity
Merchant vessels 3
Under construction 4  . Number.   69      10       -      3      10     14      12      5        9
Ordered ............ Number.        7              3      8       5      6       1      6
Delivered ............ Number.    23       3              1       1      4       5      2
Cancelled ....    ... Number.       4                                    4       3
Under contract ..  Number.     49       7       3     10      14     12       5      9        9
Naval vessels:
Under construction 4 ... Number.   99    100      95     57      46     46      42     50       44
Ordered ............ Number.       11     11       7      6      11      4      20               2
Delivered ....    .   Number.      19     26      15     17      11      8      12      6
Under contra.ct..     Number.      91     85      87     46      46     42      50     44       46
Unfinished work
Commercial ships ....... Mil. dol.  2,070  450       -    93.4  365.4   572.1  746.5   594.6  1917.0
Naval ships ........... Mil. dol.  7,107  12,091 24,495  20,768  17,734  20116  19,097 22,385.6 21,589.5
- Represents zero. 1 As of June 1  2 Annual average of monthly data  3 Vessels of 1,000 tons or larger 4 As of Jan. 1.
As of Dec. 31.
Source: 1980 and 1985, Shipbuilders Council of America, Arlington, VA., unpublished data, beginning 1990, U.S. Maritime
Administration, unpublished data.
Headnotes immediately below table                    Unit indicators show the specified quan-
tities provide information important for             titles in which data items are presented.
correct interpretation or evaluation of              They are used for two primary reasons.
the table as a whole or for a major seg-             Sometimes data are not available in
ment of it.                                          absolute form and are estimates (as in
Footnotes below the bottom         rule of          the case of many surveys). In other
tables give information relating to spe-             cases we round the numbers in order to
cific items or figures within the table.             save space to show more data, as in the
case above.

EXAMPLES OF UNIT INDICATOR INTERPRETATION FROM TABLE
Year                 Item             Unit Indicator    Number
shown
.............  Em ployment  .............  Thousands ..........  178.0
.............  Unfinished  work  ...........  $  M illions  ...........  2,070
To Determine the Figure It Is Necessary to Multiply the
Number Shown by the Unit Indicator:
Employment - 178.0 x 1,000 = 178,000 (Almost 180 thousand)
Unfinished work - 2,070 x 1,000,000 - $2,070,000,000 (over $2 billion).

Multiplier
1 000
1,000000

When a table presents data with more
than one unit indicator, they are found
in the headnotes and column headings
(Tables 2 and 4), spanner (Table 42),
stub (Table 30), or unit column (shown
above). When the data in a table are
shown in the same unit indicator, it is
shown in boldface as the first part of
the headnote (Table 2). If no unit indica-
tor is shown, data presented are in
absolute form (Table 1).
Vertical rules are used to separate inde-
pendent sections of a table, (Table 1 ),
or in tables where the stub is continued
into one or more additional columns
(Table 2).
Averages-An average is a single num-
ber or value that is often used to repre-
sent the typical value of a group of
numbers. It is regarded as a measure of
location or central tendency of a
group of numbers.

The arithmetic mean is the type of aver-
age used most frequently. It is derived
by summing the individual item values
of a particular group and dividing the
total by the number of items. The arith-
metic mean is often referred to as sim-
ply the mean or average.
The median of a group of numbers is
the middle number or value when each
item in the group is arranged according
to size (lowest to highest or visa versa);
it generally has the same number of
items above it as well as below it. If
there is an even number if items in the
group, the median is taken to be the
average of the two middle numbers.
Per capita (or per person) quantities. A
per capita figure represents an average
computed for every person in a speci-
fied group (or population). It is derived
by taking the total for an item (such as
income, taxes, or retail sales) and divid-
ing it by the number of persons in the
specified population.
Guide to Tabular Presentation ix

U.S. Census Bureau, Statistical Abstract of the United States: 2000

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