Literaturnachweis - Detailanzeige
| Autor/inn/en | Yoo, Seung-Hoon; Moon, Hye-Seon |
|---|---|
| Titel | A semi-parametric modeling of firms' R&D expenditures with zero values. |
| Quelle | In: Scientometrics, (2006) 1, S.57-67
PDF als Volltext |
| Dokumenttyp | gedruckt; online; Zeitschriftenaufsatz |
| ISSN | 0138-9130 |
| DOI | 10.1007/s11192-006-0138-5 |
| Schlagwörter | Tobit Model; Lagrangian Multiplier Test; Investment Ratio; Expenditure Equation; Sales Amount |
| Abstract | Summary Modeling firms' R&D expenditures often become complicated due to the zero values reported by a significant number of firms. The maximum likelihood (ML) estimation of the Tobit model, which is usually adopted in this case, however, is not robust to heteroscedastic and/or non-normal error structure. Thus, this paper attempts to apply symmetrically trimmed least squares estimation as a semi-parametric estimation of the Tobit model in order to model firms' R&D expenditures with zero values. The result of specification test indicates the semi-parametric estimation outperforms the parametric ML estimation significantly. |
| Erfasst von | OLC |
| Update | 2023/2/05 |
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