We derive a central limit theorem for the number of vertices of convex
polytopes induced by stationary Poisson hyperplane processes in $\mathbb{R}^d$.
This result generalizes an earlier one proved by Paroux [Adv. in Appl. Probab.
30 (1998) 640--656] for intersection points of motion-invariant Poisson line
processes in $\mathbb{R}^2$. Our proof is based on Hoeffding's decomposition of
$U$-statistics which seems to be more efficient and adequate to tackle the
higher-dimensional case than the ``method of moments'' used in [Adv. in Appl.
Probab. 30 (1998) 640--656] to treat the case $d=2$. Moreover, we extend our
central limit theorem in several directions. First we consider $k$-flat
processes induced by Poisson hyperplane processes in $\mathbb{R}^d$ for $0\le
k\le d-1$. Second we derive (asymptotic) confidence intervals for the
intensities of these $k$-flat processes and, third, we prove multivariate
central limit theorems for the $d$-dimensional joint vectors of numbers of
$k$-flats and their $k$-volumes, respectively, in an increasing spherical
region.Comment: Published at http://dx.doi.org/10.1214/105051606000000033 in the
Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute
of Mathematical Statistics (http://www.imstat.org