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Pakes,A.andZ.Griliches(1984).PatentsandR&DattheFirmLevel:A
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FirstLook,VolumeI.UniversityofChicagoPress. Rab e-Hesketh,A.S.S.,andA.Pickles.(2004).Generalizedmultilevelstructural equationmo deling.Psychometrika69,167-190. Ro o dman,D.(2011).Mixed-pro cess,EstimatingfullyobservedrecursiveCmp, mo delswith.StataJournal11(2),159-206.
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