Curved exponential families



Curved exponential families generalise exponential families while preserving some of the magic, I guess?

Credited to (Efron 2004) and used in Efron (1978) to show some nice behaviour for degrees of freedom-based penalties. Will read soon.

Examples?

References

Efron, Bradley. 1975. Defining the Curvature of a Statistical Problem (with Applications to Second Order Efficiency).” The Annals of Statistics 3 (6): 1189–1242.
———. 1978. The Geometry of Exponential Families.” The Annals of Statistics 6 (2): 362–76.
———. 2004. The Estimation of Prediction Error.” Journal of the American Statistical Association 99 (467): 619–32.
Keener, Robert W. 2009. Curved Exponential Families.” In Theoretical Statistics, 85–99. Springer Texts in Statistics. Springer New York.

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