AHS Digest

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From: Kimiko Shiki <kshiki@ucla.edu> on 1/8/2007 8:41:17 PM
Subject: OT: Metro status of previous locations in the post-1997 AHS data

The post-1997 AHS data do not have the variable that shows metropolitan
status of previous locations (e.g. central city or suburbs of the same
MSA, outside the MSA, and abroad) while the pre-1997 AHS data
(1985-1995) have this variable. AHS does not collect this information
anymore, or they just do not make this information public?

I am thinking of applying for confidential data access to the Center for
Economic Studies (CES). What geographical level would be available for
locations of current and previous residence if my proposal was approved
for access to pre- or post- 1997 AHS confidential data?

I would appreciate anyone answering my questions...



Kimiko Shiki
Ph.D. Candidate
Department of Urban Planning
UCLA School of Public Affairs



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From: Kimiko Shiki <kshiki@ucla.edu> on 1/9/2007 1:06:40 PM
Subject: OT: Re: Metro status of previous locations in the post-1997 AHS data

Thanks, Greg. I looked at the documentation Greg listed below. The
documentation provides a discussion of the METRO variable (metro status
of current units), but still not of the XLOC variable (metro status of
previous units, the information collected only for recent movers), which
is available for the pre-1997 AHS data. Has AHS stopped collecting this
information for the post-1997 surveys?

Kimiko

Kimiko Shiki
Ph.D. Candidate
Department of Urban Planning
UCLA School of Public Affairs


Gregory J. Watson wrote:
>
> Kimiko (and others)-
>
>
>
> This is unfortunately true and was due to changes in data collection.
>
>
>
> For a discussion of this, and other changes in the 1997 AHS, please
> see the Documentation of Changes in the 1997 AHS report, located on
> HUD USER at: https://www.huduser.gov/datasets/ahs/docchg1997.pdf
> Discussion of the METRO variable is on P. 16.
>
>
>
> Greg
>
>
>
> Gregory Watson
>
> The Moran Company
>
> 1655 N. Ft. Myer Drive
>
> Suite 1250
>
> Arlington, VA 22209
>
> 703-465-9970 x416
>
> gjwatson@themorancompany.com
>
>
>
>
>
> ------------------------------------------------------------------------
>
> *From:* ahslistserv@huduser.gov [mailto:ahslistserv@huduser.gov]
> *Sent:* Tuesday, January 09, 2007 9:28 AM
> *To:* Gregory J. Watson
> *Subject:* OT: Metro status of previous locations in the post-1997 AHS
> data
>
>
>
> From: American Housing Survey (AHS) ListServ <ahs@huduser.gov>
>
> The post-1997 AHS data do not have the variable that shows metropolitan
> status of previous locations (e.g. central city or suburbs of the same
> MSA, outside the MSA, and abroad) while the pre-1997 AHS data
> (1985-1995) have this variable. AHS does not collect this information
> anymore, or they just do not make this information public?
>
> I am thinking of applying for confidential data access to the Center for
> Economic Studies (CES). What geographical level would be available for
> locations of current and previous residence if my proposal was approved
> for access to pre- or post- 1997 AHS confidential data?
>
> I would appreciate anyone answering my questions...
>
>
>
> Kimiko Shiki
> Ph.D. Candidate
> Department of Urban Planning
> UCLA School of Public Affairs
>
>
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From: david_a._vandenbroucke@hud.gov on 1/10/2007 3:01:52 PM
Subject: AHS: Updated 2005 Public Use File

An updated version of the AHS 2005 public use file has been posted on the HUD
USER web site, https://www.huduser.gov/portal/datasets/ahs.html . Here is an
extract from the release notes:

UNIT SQUARE FEET AND LOT SIZE
Because of a processing error, the topcoding for UNITSF and
LOT was done incorrectly. In the previous version of the
dataset, some records had values of 4300 for UNITSF, and some
had 10421. The correct topcoded value is 10099. Similarly, for
some records LOT was erroneously given the value 999987
instead of the correct topcode, 983834. The new file has the
correct values.

ADDITIONAL RECORDS FOR NONINTERVIEW CASES
The AHS is a longitudinal survey which can be used to trace
changes in the housing stock over time. Because of this, our
practice is to include records for housing units that are no
longer in the sample, either because the units have ceased to
exist or because of a change in the sampling strategy. The
previous version of the dataset did not include records for
some "Type C" noninterview cases. Type C cases are housing
units that were permanently deleted from the stock (for
example, by demolition). In addition to these, the previous
dataset omitted records for the manufactured (mobile) home
units that were dropped from the sample when the Census Bureau
drew a new sample of such units from the 2000 census. These
omitted records have been restored, so that users who are
interested in longitudinal analysis can trace what happened to
them. The new version of the dataset includes 9,439 additional
records. The records for the dropped manufactured housing
units have NOINT=38 “Type C - Unit eliminated in subsampling.”

Note that all Type C cases have zero weights. Thus, most
tabulations performed using the previous version of the
dataset should be unaffected by the addition of these cases.

CHANGES IN INCOME LIMITS AND FAIR MARKET RENTS
The inclusion of additional noninterview cases led to small
changes in some values for the income limit and fair market
rent variables. Specifically, some noninterviewed cases had
been inappropriately included in the calculation of minimum
and maximum income limits and fair market rents (FMRA, FMRB,
L50A, L50B). Also, a small number of interviewed cases outside
of identified metropolitan areas (that is, cases with SMSA =
9999) had been inappropriately excluded from the calculations
of minimum, maximum, and mean income limits and fair market
rents (FMR, FMRA, FMRB, L50, L50A, L50B). A total of 4,623
interviewed cases (STATUS = 1,2,3), all with SMSA=9999, change
compared to the last PUF. The FMR change is always less than
2.5 percent, and averages 0.7 percent. The changes to L50
(very low income threshold) are always less than 1 percent.

Dav Vandenbroucke
Senior Economist
U.S. Dept. HUD
david_a._vandenbroucke@hud.gov
202-708-1060 ext. 5890


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