*J. Japan Statist. Soc.,* Vol. 33 (No. 2), pp. 231-244, 2003

## Sequential Estimation of The Ratio of Scale Parameters in The Exponential Two-Sample Problem

Chikara Uno

**Abstract. **
We consider a sequential point estimation of the ratio of two exponential scale parameters. For a fully sequential sampling scheme, second order approximations are obtained to the expected sample size and the risk of the sequential procedure. We also propose a bias-corrected procedure to reduce the risk.

*Key words and phrases*:
Doob's maximal inequality, fully sequential procedure, regret, second order approximation, Wald's lemma.

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