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The non-declared vote in the surveys: The Spanish case in the 1980s Urquizu Sancho, Ignacio 327(460) Vote Hidden Sample Bias Heckman Ciencias Sociales 59 Ciencia Política 63 Sociología Do individuals conceal their voting intentions? If so, why? In this article the author attempts to answer both these questions through a case study of declared voting intentions for the two main Spanish political parties in the 1980s. His analysis shows that the distribution of the hidden vote has not remained constant over time. Whereas in the early 1980s conservative voters were more likely not to disclose their vote, later in the decade a number of decisions taken by the Socialist government led some leftwing voters to hide their partisan preferences from pollsters. Sección Deptal. de Sociología Aplicada (Ciencias de la Información) Fac. de Ciencias de la Información TRUE pub 2025-12-18T14:55:07Z 2025-12-18T14:55:07Z 2006 journal article AM https://hdl.handle.net/20.500.14352/129345 0261-3794 10.1016/J.ELECTSTUD.2005.03.008 eng Urquizu-Sancho, I. (2006). The non-declared vote in the surveys: The Spanish case in the 1980s. Electoral Studies, 25(1), 103-128. https://doi.org/10.1016/J.ELECTSTUD.2005.03.008 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ restricted access application/pdf Elsevier