FAQ for SCF Combined Extract Data
These FAQs apply specifically to the SDA version of the SCF Extract Datafile.
For the more general FAQ file provided by the Federal Reserve for the
see the FAQs
on the Web site of the Federal Reserve System.
Note in particular
the question there
about why some numbers in the various
Federal Reserve Bulletin articles
may not match exactly the results obtained from the public datasets.
NOTE: All values in the Extract SDA dataset are in 2019 dollars
How do I calculate medians or percentiles?
In order to calculate
Medians or single specified Percentiles
in SDA, a user should click on the 'Analysis' button,
then click on the 'Means' tab.
In the form that appears,
the user should enter the name of the variable of interest
into the 'Dependent:' text box.
Also enter the name of a break variable
into the 'Row:' text box.
(You can also enter another break variable into
the 'Column:' text box, but that is optional.)
In the 'Median/Percentile Options' section,
select either 'Median' or 'Percentile' from the drop-down list.
If you select 'Percentile', you can select the single percentile
value that you want to see in each cell
(the default is the 90th percentile of the dependent variable).
You can also specify that the chart be based on the median or percentile,
instead of on the mean of the dependent variable.
Then click the 'Run the Table' button. In the table that is created,
the median or percentile of the dependent variable will appear as
the first statistic in each cell.
Are all values real?
Yes. All values are real values. They are in the most current survey's dollars.
How do I get the nominal values?
Multiply the variable you want to put in nominal terms by the
CPI_DEFL variable, and save it as a new varible. This new variable
will now be in nominal terms.
Does upper/lower case matter for the names of variables?
In the SCF dataset, the names of variables are case insensitive.
This means that NETWORTH, networth, and Networth all refer to the same variable.
How do I get results for a single survey year?
To get results for a single survey year, enter 'YEAR(*year*)' into the 'Selection
Filter(s):' text box. So, if you wanted to get results for 2004, enter 'YEAR(2004)'
into the 'Selection Filter(s):' text box.
How do I get combined results for a group of survey years?
To get combined results for multiple survey years,
enter 'YEAR(*years*)' into the 'Selection
Filter(s):' text box.
So, if you wanted to get results for 2001 through 2007,
enter 'YEAR(2001-2007)' into the 'Selection Filter(s):' text box.
You can also filter for discrete years.
For example: 'YEAR(1992,1998,2001)'.
How do I get separate results (means and medians/percentiles) for multiple years?
You get separate results for years by entering
YEAR into either the 'Row' or 'Column' text boxes, as you prefer.
Say you want to calculate mean (and median or percentile)
real net worth by age group for each of the survey
years 2001 to 2007.
To get those results, do the following:
Click on the 'Analysis' button at the top of the page, then the 'Means' tab.
In the variable tree, click on the arrow next to the NETWORTH 'folder' to open it,
then click on the NETWORTH variable. The name appears above in the 'Selected:' box.
Click the 'Dep' button directly beneath it,
to transfer the variable name to the box on the form for the 'Dependent variable.
(Or you can just drag and drop NETWORTH into the box for the dependent variable.)
Next, select YEAR from the TECHNICAL category ('folder') and click on the 'Row' button.
(Or drag and drop YEAR.)
Next, click AGECL from the DEMOGRAPHICS category and click on the 'Col' button.
(Or drag and drop AGECL.)
Then on the 'Selection Filter(s):' line, enter 'year(2001-2007)'.
If you want medians or percentiles, in addition to means,
click on 'Median/Percentile Options',
then select 'Median' or 'Percentile' from the drop-down list.
Also check the box to base the chart on medians/percentiles (instead of means),
if you prefer. If you want a line chart instead of a bar chart,
go into 'Chart Options' and select that option.
Finally, click the 'Run the Table' button at the bottom of the page.
This will give you the table of means (and medians or percentiles,
if requested) and a bar chart or line chart of the statistics you requested.
Where can I get more information about the options?
For more information about any specific feature in SDA,
click the related question mark ('?') in the form.
For example, for information on entering selection filter(s),
click on the question mark after the 'Selection Filter(s):'
label in the form.
Alternatively, you can click on the 'General' help hyperlink
at the top of the form, or the 'FAQ' link at the top of the page.
How were the extract variables created from the survey data?
The program used to create the extract variables from the survey data
may be viewed