Guus Balkema

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In many cultures, the erect penis has been a symbol of masculine qualities. Because of this symbolism, a penis that is less than average size can cause insecurity or embarrassment. This series reports the authors' 18-year experience in the management of 60 men with a complaint of a small penis. For 44 of these 60 men, counseling was sufficient; the other 16(More)
This paper presents a continuous one parameter family of multivariate generalized Pareto distributions which describe the asymptotic behaviour of exceedances over linear thresholds. The one–dimensional theory has proved to be important in insurance, finance and risk management. The multivariate limit theory presented here is developed with similar(More)
Multivariate risk analysis is concerned with extreme observations. If the underlying distribution has a unimodal density then both the decay rate of the tails and the asymptotic shape of the level sets of the density are of importance for the dependence structure of extreme observations. For heavy-tailed densities, the sample clouds converge in distribution(More)
A Pareto distribution has the property that any tail of the distribution has the same shape as the original distribution. The exponential distribution and the uniform distribution have the tail property too. The tail property characterizes the univariate generalized Pareto distributions. There are three classes of univariate GPDs: Pareto distributions,(More)
Penis lengthening pills, stretch apparatus, vacuum pumps, silicone injections, and lengthening and thickening operations are available for men who worry about their penis size. Surgery is thus far the only proven scientific method for penile enlargement. In this article, we consider patient selection, outcome evaluation, and techniques applied. In our view,(More)
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