Table A-1. SEASONAL INDEXES USED TO ADJUST PRIVATE HOUSING STARTS: MONTHLY 1977 TO 1978

1

The implicit seasonal index is the ratio of the unadjusted number of housing units started in the United States adjusted national totals of housing units started.

to the seasonally

Table A-2. SEASONAL INDEXES TO ADJUST HOUSING UNITS AUTHORIZED IN PERMIT-ISSUING PLACES AND MANUFACTURERS' SHIPMENTS OF MOBILE HOMES: MONTHLY 1977 TO 1978

The implicit seasonal index is the ratio of the unadjusted number of housing units authorized by building permits in the United States to the seasonally adjusted national totals of housing units authorized.

The implicit index does not include mobile home shipments.

2 Based on data for the period January 1959 through September 1977.

Table A-3. AVERAGE PERCENTAGE CHANGES AND RELATED MEASURES FOR MONTHLY HOUSING STARTS, PERMIT AUTHORIZATIONS, AND MOBILE HOME SHIPMENTS

The following are brief definitions of the measures shown in this table. More complete explanations appear in Electronic Computers and Business Indicators by Julius Shiskin, issued as Occasional Paper 57 by the National Bureau of Economic Research, 1957 (reprinted from the Journal of Business, October 1957).

O is the average month-to-month percentage change, without regard to sign, in the original series.

'CI' is the average month-to-month percentage change, without regard to sign, in the seasonally adjusted series.

'I' is the average month-to-month percentage change, without regard to sign, for the irregular component, which is obtained by dividing the cyclical component into the seasonally adjusted series.

'C' is the average month-to-month percentage change, without regard to sign, in the cyclical component. 'C' is a smooth, flexible moving average of the seasonally adjusted series.

I/C is the average month-to-month percentage change, without regard to sign, of the irregular component divided by the average month-tomonth percentage change, without regard to sign, of the cyclical component. It serves as an indication of the series' relative smoothness (small values) or irregularity (large values).

MCD (months for cyclical dominance) gives an estimate of the appropriate time span over which to observe cyclical movement in a monthly series. In deriving MCD the average (without regard to sign) percentage changes in the irregular and in the cyclical component are computed for 1-month spans (Jan.-Feb., Feb.-Mar., etc.), 2-month spans (Jan.-Mar., Feb. -Apr., etc.) up to 5-month spans. MCD is the shortest span for which the average change (without regard to sign) in the cyclical component is larger than the average change (without regard to sign) in the irregular component; thus it indicates the point at which fluctuations begin to be more attributable to cyclical than to irregular movements. Since changes are not computed for spans greater than 5 months, all series with an MCD greater than "5" are shown as "6". MCD is small for smooth series and large for erratic series.

CURRENT
CONSTRUCTION
REPORTS

CONSTRUCTION accounts
for approximately 12 percent
of the gross national product!
To assist industry representatives,
research specialists, market analysts,
and government officials interested
in this vital segment of the Nation's
economy, the Bureau of the Census
issues monthly, quarterly, and
annual reports on the value of new
construction put in place, building
permits, housing starts, housing
completions, housing sales,
alterations and repairs and

demolition of residential structures.

Current Construction Reports include:
C20 Housing Starts

C21 New Residential Construction in
Selected Standard Metropolitan
Statistical Areas

C22

Housing Completions

C25 - Sales of New One-Family Houses
C27 - Price Index of New One-Family
Houses Sold

C30- Value of New Construction Put
in Place

C40 Housing Authorized by Building
Permits and Public Contracts

C41 Authorized Construction-
Washington, D.C. Area

C45 Permits Issued for Demolition
of Residential Structures in
Selected Cities

C50 - Expenditures on Residential
Additions, Alterations,
Maintenance and Repairs, and
Replacements

Now
Available

1976 Data on
Employment,
Payrolls, &
Establishments
County Business Patterns pre-

sents intercensal data on em-
ployment, number and em-
ployment size of establish-
ments, and payrolls by 2-, 3-,
and 4-digit levles of the
Standard Industrial Classifi-
cation (SIC) for States and

counties. This annual series

(please detach here)

OUS

COUNTY
BUSINESS
PATTERNS
1976

of establishments, employ-
ment, and payroll data are
also provided by employment-
size class to the 4-digit SIC
level. Also included, by
major industry group, are
data on the number of
establishments, employees,
and payroll of administra-
tive and auxiliary establish-
ments.

includes a separate paper-
bound report for the United
States, each State, and the
District of Columbia.

CBP is a standard reference
source of small-area data for
businessmen, market re-
civic planners.
searchers, and industrial and

CBP data are especially use-
ful for:

Transportation and other
public utilities
Retail trade
Wholesale trade

Finance, insurance, and
real estate
Services

Determining location and
size of sales territories
Establishing sales quotas and
advertising budgets
Locating production, market-
ing, and service facilities.
Analyzing market potentials

The individual State reports
present for the State, num-
ber of establishments, em-
ployment, and payroll data
by employment-size class to
cluded, by major industry
group, are data on the num-
ber of establishments with
the 4-digit SIC level. Also in-
1,000 or more employees,
by employment-size class.
The U.S. Summary includes
data by detailed industry
(4-digit SIC) level for the
United States and by major
group (2-digit SIC) for each
State. For the U.S., number

Please send me an order form for County Business Patterns, 1976

Name

Street Address

City

CBP data are shown in detail
for the following broad in-
dustry categories:
Agricultural services, forest-
Mining
ry, and fisheries

Contract construction
Manufacturing

MAIL FORM TO:

Data in Other
Formats

Published CBP data, by
county and by industry, will
be available at cost, on com-
puter tapes. Inquiries should
be addressed to Chief, Data
User Services Division,
Bureau of the Census, Wash-
ington, D.C. 20233.

The reports described in this
announcement are also avail-
able on microfiche. For
further information, contact:
Census Library, Washington,
D.C. 20233

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