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    "# Mann-Whitney U test\n",
    "\n",
    "Example illustrating Mann-Whitney U test with statsample.\n",
    "\n",
    "#### References\n",
    "\n",
    "http://en.wikipedia.org/wiki/Mann%E2%80%93Whitney_U_test"
   ]
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     "text": [
      "Analysis 2016-03-26 02:37:49 +0000\n",
      "= Statsample::Test::UMannWhitney\n",
      "  == Mann-Whitney's U\n",
      "    Mann-Whitney's U results\n",
      "+--------------------------------------+-------------------+\n",
      "| Sum of ranks                         | 81.000            |\n",
      "| Sum of ranks                         | 384.000           |\n",
      "| U Value                              | 26.000            |\n",
      "| Z                                    | -3.258 (p: 0.001) |\n",
      "| Exact p (Dinneen & Blakesley, 1973): | 0.001             |\n",
      "+--------------------------------------+-------------------+\n",
      "\n",
      "\n"
     ]
    }
   ],
   "source": [
    "require 'statsample'\n",
    "\n",
    "Statsample::Analysis.store(Statsample::Test::UMannWhitney) do\n",
    "\n",
    "  a = Daru::Vector.new(10.times.map {rand(100)})\n",
    "  b = Daru::Vector.new(20.times.map {(rand(20))**2+50})\n",
    "\n",
    "  u=Statsample::Test::UMannWhitney.new(a,b)\n",
    "  summary u\n",
    "end\n",
    "  Statsample::Analysis.run_batch"
   ]
  }
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