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This paper is devoted to the problem of the statistical properties of P-violating effects in neutron-induced reac- tions on complex nuclei. The latest experimental result (1) on the parity-violating longitudinal analyzing power P in Th was interpreted as being inconsistent with the conventional model of parity mixing on the compound nuclear stage. We will show that this conclusion may not be correct and that a more complete experimental investi- gation is required to test the conventional model. First, we shall recall some theoretical results related to this problem. Let us consider the total cross-section (o.+) difference for opposite neutron helicities for the neutron transmission through the target. This difference can be expressed through the amplitudes f+ for the forward scattering of neutrons with positive and negative helici- ties as

Sign correlations and the mechanism for parity violation