The experience of regret rests on a counterfactual analysis of events. Previous research indicates that regret emerges at around 6 years of age, marginally later than the age at which children begin to answer counterfactual questions correctly. We hypothesized that the late emergence of regret relative to early counterfactual thinking is a result of the executive demands of simultaneously holdi...

We discuss a multiple-play multi-armed bandit (MAB) problem in which several arms are selected at each round. Recently, Thompson sampling (TS), a randomized algorithm with a Bayesian spirit, has attracted much attention for its empirically excellent performance, and it is revealed to have an optimal regret bound in the standard single-play MAB problem. In this paper, we propose the multiple-pla...

We introduce a general class of learning algorithms, regret-matching algorithms, and a regret-based framework for analyzing their performance in online decision problems. Our analytic framework is based on a set Φ of transformations over the set of actions. Specifically, we calculate a Φ-regret vector by comparing the average reward obtained by an agent over some finite sequence of rounds to th...

Algorithms based on upper-confidence bounds for balancing exploration and exploitation are gaining popularity since they are easy to implement, efficient and effective. In this paper we consider a variant of the basic algorithm for the stochastic, multi-armed bandit problem that takes into account the empirical variance of the different arms. In earlier experimental works, such algorithms were ...

BACKGROUND To counsel patients adequately, it is important to understand the variables influencing satisfaction and regret following prostatectomy. OBJECTIVE To identify independent predictors for satisfaction and regret after radical prostatectomy. DESIGN, SETTING, AND PARTICIPANTS Patients who had undergone retropubic radical prostatectomy (RRP) or robot-assisted laparoscopic radical pros...

This study was conducted to examine the moderating role of career decision regret in relationship between university students' visions about future and proactive behaviors.The consisted a total 312 students, including 167 (53.5%) females 145 (46.5%) males, at Eastern Mediterranean Region Turkey. Visions Future Scale, Career Decision Regret Engagement Scale were used as data collection tools. Co...