United States yearbook - 1982 (1)

Statistical Methodology and Reliability 913
DATA COLLECTION AND
IMPUTATION PROCEDURES
INFORMATION ON ERRORS IN THE DATA
Estimates of sampling
error
Other (nonsampling)
errors
SOURCES OF ADDITIONAL
MATERIAL
States with UCR programs
collect data directly from
Individual law enforcement
agencies and forward reports,
prepared in accordance with
UCR standards, to FBI.
Accuracy and consistency
edits performed by FBI.
Not applicable.
Coverage of 98% of the
population (99% in SMSA's,
94% in rural areas) by UCR
Program, though varying
number of agencies report
Some error present through
incorrect reporting.
U.S. Federal Bureau of
Investigation, C rim e in th e
U n ite d S ta te s .
Personal interviews
conducted every 6 months for
3 years for each household in
sample; 10,000 households
interviewed monthly.
CV in I960:4% for estimate
of personal robbery counts;
2% for household burglary
count..
Respondents recall errors
which may include reporting
incidents for other than the
reference period; interviewer
coding and processing errors;
and possible mistaken
reporting or classifying of
events. Adjustment is made
for a household noninterview
rate of about 5% and for a
smaller within-household
noninterview rate.
U.S. Bureau of Justice
Statistics, C rim in a l
V ic tim iz a tio n In th e U n ite d
S ta te s , i9 6 0 .
Quarterly personal Interviews
In census year with telephone
followups for items missed.
S.E. for estimate of total
household trips (3 1 2 ,5 3 2 ,0 0 0 )
in 1977 Is approximately
7,178,000.
Areas of possible
nonsampling errors include
memory loss on the part of
the respondents In reporting
trips and in the methods used
to estimate trip mileage. The
nonresponse rate was about
10%. ■
U.S. Bureau of the Census,
C e n s u s o f T ra n s p o rta tio n ,
1 97 7, N a tio n a l T ra v e l S u rv e y ,
Report No. TC77-N-2.
Computer selection of sample
of tax return records, Data
adjusted during editing for
incorrect, missing, or
inconsistent entries to ensure
consistency with other entries
on return.
See above.
Estimated CV's for tax year
1979 {1980 not available): For
number of returns in
subgroups, ranged from .6%
for returns under $5,000 to
0% for returns over $500,000;
and from .2% for Calif., Mich.,
and Pa., returns to 2,9% for
Vermont; for adjusted gross
income less deficit, .1%; and
amount of income tax, .1 %.
Estimated CV's for 1979: For
number of returns in
subgroups, ranged from 1.5%
with assets under $100,000 to
0% with assets over $25 mil.;
for amount of net income and
amount of Income tax, .1%.
Processing errors and errors
arising from the use of
tolerance checks for the data,
See above.
U.S. Internal Revenue
Service, S ta tis tic s o l In c o m e ,
In d iv id u a l In c o m e T a x
R e tu rn s , annual.
U.S. Internal Revenue
Service, S ta tis tic s o f In c o m e ,
C o rp o ra tio n In c o m e T a x
R e tu rn s , annual.
Field compilation of financial
data from official records and
reports for States and large
local governments; mail
canvass of other units, with
mail and telephone followups.
Not applicable.
Some response errors may
arise due to respondents
interpretation of definitions
and instructions.
U.S. Bureau of the Census,
C e n s u s o f G o v e rn m e n ts,
1 97 7, various reports.