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Reference.org
Projected normal distribution
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<p>In <a href="/facts/Directional_statistics/ucnUv52T">directional statistics</a>, the projected normal distribution (also known as offset normal distribution, angular normal distribution or angular Gaussian distribution) is a <a href="/facts/Probability_distribution/EpsKKVRu">probability distribution</a> over <a href="/facts/Direction_(geometry)/Tj24mTJ8">directions</a> that describes the radial projection of a <a href="/facts/Random_variable/TwTBXnLT">random variable</a> with <a href="/facts/Multivariate_normal_distribution/2Xfegqz2">n-variate normal distribution</a> over the unit <a href="/facts/N-sphere/bFu2S7E2">(n-1)-sphere</a>. </p>