مقایسهٔ روشها
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| مدل اثرات ثابت فوریه× | مدل اثرات ثابت با پارامترهای متغیر با زمان× | |
|---|---|---|
| حوزه | اقتصادسنجی | اقتصادسنجی |
| خانواده | Regression model | Regression model |
| سال پیدایش≠ | 2006–2012 | 1975-1995 |
| پدیدآور≠ | Enders & Lee (building on Becker, Enders & Lee framework) | Hsiao (1975); Pesaran & Smith (1995) |
| نوع≠ | Panel regression with Fourier terms | Panel regression with time-varying slopes |
| منبع بنیادین≠ | Enders, W., & Lee, J. (2012). A unit root test using a Fourier series to approximate smooth breaks. Oxford Bulletin of Economics and Statistics, 74(4), 574–599. DOI ↗ | Hsiao, C. (2014). Analysis of Panel Data (3rd ed.). Cambridge University Press. ISBN: 9781107038875 |
| نامهای دیگر | Fourier FE model, Fourier panel fixed effects, trigonometric fixed effects regression, smooth structural break fixed effects | TVP-FE model, time-varying coefficients fixed effects, TVP panel model, locally time-varying fixed effects |
| مرتبط≠ | 6 | 2 |
| خلاصه≠ | The Fourier fixed effects model extends standard panel fixed effects regression by augmenting the specification with low-frequency Fourier (trigonometric) terms. These sine and cosine components approximate unknown, smooth structural shifts in the time trend without requiring the researcher to pre-specify break dates, combining within-unit identification with flexible trend modelling. | The time-varying parameter fixed effects (TVP-FE) model extends the classical two-way fixed effects panel regression by allowing one or more slope coefficients to change over time while still controlling for unobserved individual heterogeneity. It is used when the effect of a predictor on an outcome is not constant across the time dimension of a panel dataset. |
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