The statistical distribution of the heights of sea waves is various and complicated for sea state and weather conditions. This is generally expressed empirically φ(γ)= e ^{-(γ√γ) n} , γ ⁿ =1/ N N Σ i =1 γ i ⁿ where, φ (γ) is the chance that the value of wave height exceeds γ ; N is the number of waves, γ or γ _i denotes wave amplitude; n is the parameter which expresses the sea state. Usually n =2 ; and for seas n <2, for swells n > 2. When wind velocity increases, the value of n decreases, and waves all vanisch away. Even if wind velocity may be large, for prevailing wind n becomes large. So that expected rolling angle is different for each value of n . Analytical results indicate that in the centre of storm, perfect resonances occur rarely, but when it is calm weather, every rolling is almost in resonance state, but the value is usually diminished by 1/21/3.