Econometric Analysis of Panel Data

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Econometric Analysis of Panel Data William Greene Department of Economics Stern School of Business

Agenda Random Parameter Models Heterogeneity in Dynamic Panels Fixed effects Random effects Heterogeneity in Dynamic Panels Random Coefficient Vectors-Classical vs. Bayesian General RPM Swamy/Hsiao/Hildreth/Houck Hierarchical and “Two Step” Models ‘True’ Random Parameter Variation Discrete – Latent Class Continuous Classical Bayesian

Random Effects and Random Parameters

A Capital Asset Pricing Model

Heterogeneous Health Production Model

Parameter Heterogeneity

Parameter Heterogeneity

Fixed Effects (Hildreth, Houck, Hsiao, Swamy)

OLS and GLS Are Inconsistent

Estimating the “Fixed Effects” Model

Estimating the Random Parameters Model

Estimating the Random Parameters Model by OLS

Estimating the Random Parameters Model by GLS

Estimating the RPM

An Estimator for Γ

A Positive Definite Estimator for Γ

Estimating βi

Baltagi and Griffin’s Gasoline Data World Gasoline Demand Data, 18 OECD Countries, 19 years Variables in the file are COUNTRY = name of country YEAR = year, 1960-1978 LGASPCAR = log of consumption per car LINCOMEP = log of per capita income LRPMG = log of real price of gasoline LCARPCAP = log of per capita number of cars See Baltagi (2001, p. 24) for analysis of these data. The article on which the analysis is based is Baltagi, B. and Griffin, J., "Gasoline Demand in the OECD: An Application of Pooling and Testing Procedures," European Economic Review, 22, 1983, pp. 117-137.  The data were downloaded from the website for Baltagi's text.

OLS and FGLS Estimates +----------------------------------------------------+ | Overall OLS results for pooled sample. | | Residuals Sum of squares = 14.90436 | | Standard error of e = .2099898 | | Fit R-squared = .8549355 | +---------+--------------+----------------+--------+---------+ |Variable | Coefficient | Standard Error |b/St.Er.|P[|Z|>z] | Constant 2.39132562 .11693429 20.450 .0000 LINCOMEP .88996166 .03580581 24.855 .0000 LRPMG -.89179791 .03031474 -29.418 .0000 LCARPCAP -.76337275 .01860830 -41.023 .0000 +------------------------------------------------+ | Random Coefficients Model | | Residual standard deviation = .3498 | | R squared = .5976 | | Chi-squared for homogeneity test = 22202.43 | | Degrees of freedom = 68 | | Probability value for chi-squared= .000000 | CONSTANT 2.40548802 .55014979 4.372 .0000 LINCOMEP .39314902 .11729448 3.352 .0008 LRPMG -.24988767 .04372201 -5.715 .0000 LCARPCAP -.44820927 .05416460 -8.275 .0000

Country Specific Estimates Estimated Γ

Two Step Estimation (Saxonhouse)

A Hierarchical Model

Analysis of Fannie Mae Fannie Mae The Funding Advantage The Pass Through

Two Step Analysis of Fannie-Mae

Average of 370 First Step Regressions Symbol Variable Mean S.D. Coeff S.E. RM Rate % 7.23 0.79 J Jumbo 0.06 0.23 0.16 0.05 LTV1 75%-80% 0.36 0.48 0.04 LTV2 81%-90% 0.15 0.35 0.17 LTV3 >90% 0.22 0.41 New New Home 0.38 Small < $100,000 0.27 0.44 0.14 Fees Fees paid 0.62 0.52 0.03 MtgCo Mtg. Co. 0.67 0.47 0.12 R2 = 0.77

Second Step

Estimates of β1

The Minimum Distance Estimator