TY - BOOK AU - Day,Lincoln H. TI - Social insurance. Some problems for statistical research U1 - 368.40973 21 PY - 1961/// CY - New York PB - Columbia University. The Bureau of Applied Social Research KW - Hospitales KW - Estados Unidos KW - Seguridad social N1 - "Papers presented at the annual meeting of the American Association for the Advancement of Science, New York, december 1960, under the sponsorship opf the Nwe York chapter of the American Statistical Association"; Introduction / Pasul M. Densen - Opprtunities in operations / J. D. Colman, Nathan Morrison - Hospital use in Indiana and Saskatchewan / Monroe Lerner - Hospital data in community planning for the aged / MarĂ­a Fraenkel - The Massachussetts Hospital study / Paul B. Sheatsley ER -