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Table A-3.Coefficients and standard errors from multinomial logit estimations of occupational choice—ContinuedOccupation andvariableNon-SSI recipients with—SSI recipientsNo disabilityAny disabilityWork disabilityStandardStandardStandardStandardCoefficient error Coefficient error Coefficient error Coefficient errorN 2,745 1,180,588 72,686 18,414Wald chi2(252)(144)(252)(234) 31,871.16 376,139.87 21,407.64 5,561.22Prob>chi2 0.0000 0.0000 0.0000 0.0000Pseudo R2 0.1213 0.1316 0.1166 0.1117Log pseudolikelihood-5,866.55-2,782,603.70 -173,140.86 -44,143.96SOURCE: Author's calculations using the 2007 American Community Survey using sample weights.NOTES: Office and administrative support is the base outcome.. . . = not applicable.NotesAcknowledgments: The author would like to thankRichard Balkus, Susan Grad, John Kearney, Chris Silanskis,John Hennessey, L. Scott Muller, Paul O’Leary, andJim Sears for their helpful comments and suggestions.12007 dollars are used because the data in this study arefrom 2007.2For more information on the work incentives for SSIrecipients see the Red Book: A Summary Guide to EmploymentSupport for Individuals with Disabilities under theSocial Security Disability Insurance and SupplementalSecurity Income Programs, available at http://www.socialsecurity.gov/redbook.3Almost all SSI recipients are automatically eligible forMedicaid.4Scott (1992) matched industry information to administrativeSSI recipient data, but no information can be usedto identify beneficiary occupations from administrativerecords.5O*NET is the Occupational Information Network,which lists standardized occupational descriptions and isreplacing the Dictionary of Occupational Titles. See http://www.onetcenter.org for more information.6The NSCF is a survey of individuals up to age 26who currently or formerly received SSI payments or whoapplied but were denied eligibility (and their families).The NBS is a survey that is part of SSA’s evaluation of theTicket to Work initiative and gathers information on Ticketparticipants and the national beneficiary population. Moreinformation on the NSCF is available from http://www.socialsecurity.gov/disabilityresearch/nscf.htm and for theNBS from http://www.socialsecurity.gov/disabilityresearch/ttw2/appendixC.htm.7For example, even with an oversample of SSI recipients,the 2001 SIPP only included 1,614 working-age SSIrecipients, 10.3 percent of whom were working (DeCesaroand Hemmeter 2008).8The long form of the 2000 Decennial Census also hasa sufficiently large sample of SSI recipients and containsthe information necessary for a comparison with these ACSresults.9See Weathers (2005) for more information on disabilitystatistics and the ACS. Note that there is a largedifference between SSA’s definition of disability and theACS’s definition(s) of disability, particularly of “mental”disabilities.10Here and throughout the article, unemployment isdefined as an individual who is without a job, but is lookingfor work.11See http://www.bls.gov/soc/home.htm for informationon SOC codes.12In 2006 there were only 696,472 RR beneficiaries,and over a fourth of them were aged (Railroad RetirementBoard 2008). Any concurrent recipients are thus most likelyOASDI, and specifically DI, beneficiaries.13Multinomial logit models require that choices be madeindependently of other options available (the independenceof irrelevant alternatives (IIA) assumption). Although thesemodels are common in the occupational choice literature,the IIA assumption is rarely tested. Alternatives, suchas the nested logit model are not feasible for this studybecause no information is known about the characteristicsof the occupations themselves. Also, multinomial probitmodels are not computationally feasible with the currentdata. Formal tests of IIA are largely inconclusive regardingthe appropriate occupation groupings. However, theestimates using only the six broad occupation groups —(1)72 Social Security Bulletin • Vol. 69 • No. 3 • 2009