| What
is a Census 2000 SF3? |
Summary
File 3 (SF3) consists of 813 detailed tables of Census
2000 social, economic and housing characteristics compiled
from a sample of approximately 19 million housing units
(about 1 in 6 households) that received the Census 2000
long-form questionnaire. Fifty-one tables are repeated
for nine major race and Hispanic or Latino groups: White
alone; Black or African American alone; American Indian
and Alaska Native alone; Asian alone; Native Hawaiian
and Other Pacific Islander alone; Some other race alone;
Two or more races; Hispanic or Latino; and White alone,
not Hispanic or Latino. |
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| What
data formats are available? |
The Atlas Census 2000 SF3 downloader currently offers
two formats for downloading SF3 data: comma separate values
(csv) and ESRI shapefile (shp). To view a web page with
more information about these two formats, click
here. |
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| What
programs can I use to view the SF3 files? |
A number of different programs can read the csv and shp
formats. MicroSoft Excel and Access can easily read the
csv format. Most GIS applications can do so also. Most
GIS applications such as Intergraph Geomedia and ESRI
ArcView can read the shp format and create thematic maps.
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| Where
can I get more information about SF3 data? |
For
more information, see the "U.S. Census Bureau,
2000 Census of Population and Housing, Summary File
3: Technical Documentation, 2002" document which
can be downloaded from Atlas at http://atlas.lsu.edu/census2000sf3/sf3.pdf.
For more information about Census SF3 data, visit the
U.S. Census Bureau's website at http://www.census.gov/Press-Release/www/2002/sumfile3.html. |
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| How
can view the SF3 data online? |
The parish data of SF3 can be viewed through the Atlas
Demographics Page at http://atlas.lsu.edu/demographics. |
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| What
summary levels can I download from Atlas? |
The geography summary levels available through the Atlas
Census 2000 SF3 downloader are block groups (for the tables
P### and H###), tracts, parishes, congressional districts
for the 106th Congress, and zip code tabulations areas
for 3 digit and 5 digit zip codes. To view a web page
with more information abou the geography summary levels,
click
here. |
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| What
is the difference between SF3 data and data from SF1 and
SF2? |
SF3 data uses data from the Census 2000 long form whereas
SF1 and SF2 uses short form data. Since not every household
received a long form, as in earlier censuses, the responses
from the sample of households reporting on long forms
must be weighted to reflect the entire population. Specifically,
each responding household represents, on average, six
or seven other households who reported using short forms.
For information regarding comparing SF3 and SF1 data,
visit
http://www.census.gov/Press-Release/www/2002/sf3compnote.html
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| Why
does Atlas need to "assemble" some datasets? |
There
are 813 tables that can be downloaded by at least five
different geography summary levels in two different formats
making 8,130 different Winzip archives needed to download
the SF3. Instead of creating all 8,130 archives at once,
Atlas creates them as needed. The first time that an Atlas
requests a particular table-geography-format combination,
Atlas creates the Winzip archive and downloads it for
the user. Atlas also stores the Winzip archive for reuse
when a later user requests the same table-geography-format
combination. |
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