5,272 research outputs found
Identification of hedonic equilibrium and nonseparable simultaneous equations
This paper derives conditions under which preferences and technology are
nonparametrically identified in hedonic equilibrium models, where products are
differentiated along more than one dimension and agents are characterized by
several dimensions of unobserved heterogeneity. With products differentiated
along a quality index and agents characterized by scalar unobserved
heterogeneity, single crossing conditions on preferences and technology provide
identifying restrictions in Ekeland, Heckman and Nesheim (2004) and Heckman,
Matzkin and Nesheim (2010). We develop similar shape restrictions in the
multi-attribute case. These shape restrictions, which are based on optimal
transport theory and generalized convexity, allow us to identify preferences
for goods differentiated along multiple dimensions, from the observation of a
single market. We thereby derive nonparametric identification results for
nonseparable simultaneous equations and multi-attribute hedonic equilibrium
models with (possibly) multiple dimensions of unobserved heterogeneity. One of
our results is a proof of absolute continuity of the distribution of
endogenously traded qualities, which is of independent interest.Comment: Journal of Political Economy (2020+
Data base for crack growth properties of materials
A computerized data base of crack growth properties of materials was developed for use in fracture control analysis of rocket engine components and other NASA space hardware. The software system has files of basic crack growth rate data, other fracture mechanics material properties such as fracture toughness and environmental crack growth threshold values, and plotting and fitting routines for deriving material properties for use in fracture control analysis. An extensive amount of data was collected and entered, and work is continuing on compiling additional data. The data base and software codes are useful both for fracture control analysis and for evaluation or development of improved crack growth theories
Kiss me again (F): written on the theme of If I were on the stage from the comic opera Mlle. Modiste
https://digitalcommons.ithaca.edu/sheetmusic/1085/thumbnail.jp
Come, Be My Wife! : Ottilie and Girls
https://digitalcommons.library.umaine.edu/mmb-vp/5848/thumbnail.jp
I\u27d Love To Be A Lady : Duo
https://digitalcommons.library.umaine.edu/mmb-vp/5871/thumbnail.jp
If I Were On The Stage : Kiss Me Again
https://digitalcommons.library.umaine.edu/mmb-vp/1813/thumbnail.jp
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