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MathGroup Archive 2002

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help on bootstrap sample

  • To: mathgroup at smc.vnet.net
  • Subject: [mg37350] help on bootstrap sample
  • From: Søren Merser <merser at image.dk>
  • Date: Fri, 25 Oct 2002 02:46:28 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Mathematica freeks
I've made two small rutines for sampling (bootstrap statistics)
They are working , but at least 'SampleNoReplace' is rather slow
I was wondering if any of you know of a faster way to do this
Regards soren

SampelReplace[data_List:{0, 1}, n_:1] := 
  Module[{}, data[[Table[Random[Integer, {1, Length@data} ], {n}]]]]

SampelNoReplace[data_List, n_] := Module[{idx, len, res, d, hi, i},
    d = data;
    res = {};
    len = hi = Length@d;
    
    For[i = 1, i <= n && i <= len, i++,
      idx = Random[Integer, {1, hi--} ];
      AppendTo[res, d[[idx]]];
      d = Drop[d, {idx}];
      ];
    res
    ]





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