Discussion :

[stig_66]

Bonjour, je dois réaliser un projet .

J'ai un fichier ( type texte ) de données qui contient des données manquantes :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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5/31/2012,04:38,1.8725,.00002,36.20306,2.873,265.8,0
5/31/2012,04:39,2.3673,.00036,34.23096,2.443,266.8,0
5/31/2012,04:40,2.7554,NaN,32.38758,NaN,270.4,0
5/31/2012,04:41,3.1046,.00099,30.66750,2.924,277.8,0
5/31/2012,04:42,3.4442,.00074,29.06464,3.228,274.4,0
5/31/2012,04:43,3.9099,NaN,27.57250,3,275.4,0
5/31/2012,04:44,4.5211,.00033,26.18433,2.379,275.8,0
5/31/2012,04:45,5.2779,.0004,24.89334,2.493,267.7,0
5/31/2012,04:46,NaN,.00154,23.69281,2.455,271.5,0
5/31/2012,04:47,7.2668,.00881,22.57620,2.785,278.2,0
5/31/2012,04:48,8.6542,NaN,21.53726,2.506,275.1,0
5/31/2012,04:49,9.9348,.04405,NaN,1.999,275.9,0
5/31/2012,04:50,10.944,.05872,19.66895,1.822,NaN,0
5/31/2012,04:51,11.749,.07276,18.82879,1.733,275.7,0
5/31/2012,04:52,12.496,.08798,18.04470,1.429,NaN,0
5/31/2012,04:53,13.234,.10477,NaN,1.075,257.7,0
5/31/2012,04:54,NaN,.12093,16.62726,.952,244.6,0
5/31/2012,04:55,14.796,NaN,15.98601,.253,226.3,0
5/31/2012,04:56,15.446,.15869,NaN,1.049,240.4,0
5/31/2012,04:57,16.096,.17676,14.82110,1.214,252.2,0
5/31/2012,04:58,16.852,.19879,NaN,1.543,260,0
5/31/2012,04:59,17.667,NaN,13.79320,NaN,262,0
5/31/2012,05:00,18.618,.23293,13.32416,1.619,264.5,0
5/31/2012,05:01,19.656,NaN,12.88204,1.366,266.7,0
5/31/2012,05:02,20.452,.27694,12.46484,.999,267.3,0
5/31/2012,05:03,NaN,.30313,12.07071,.986,275.5,0
5/31/2012,05:04,21.597,.33153,11.69797,.579,280.3,0
5/31/2012,05:05,22.169,.36258,11.34510,.931,326.5,0
5/31/2012,05:06,22.654,.39111,11.01067,1.252,331.1,0
5/31/2012,05:07,23.11,.41924,10.69341,1.303,338,0
5/31/2012,05:08,NaN,.44596,10.39213,1.176,311.3,0
5/31/2012,05:09,23.983,.4742,10.10575,1.987,291.3,0
5/31/2012,05:10,24.565,.50242,NaN,2.278,288.4,0
5/31/2012,05:11,25.41,.52899,9.57379,2.227,289.8,0
5/31/2012,05:12,26.486,.56137,9.32646,2.367,286,0
5/31/2012,05:13,27.631,NaN,9.09050,2.139,283,0
5/31/2012,05:14,28.747,.62108,8.86521,2.151,277.8,0
5/31/2012,05:15,29.834,.64928,NaN,1.089,295.7,0
5/31/2012,05:16,30.687,.67502,8.44401,.525,304.7,0
5/31/2012,05:17,31.221,.69968,8.24694,1.18,286.3,0
5/31/2012,05:18,31.57,.73472,8.05817,2.43,NaN,0
5/31/2012,05:19,32.162,NaN,7.87723,2.835,277.4,0
5/31/2012,05:20,32.812,.80465,7.70366,2.835,277.3,0
5/31/2012,05:21,33.462,.83578,NaN,2.759,271.8,0
5/31/2012,05:22,33.802,.86048,7.37701,NaN,273.2,0
5/31/2012,05:23,33.957,.88739,7.22318,2.202,279.9,0
5/31/2012,05:24,33.811,NaN,7.07523,2.291,272.2,0
5/31/2012,05:25,33.763,.94298,6.93284,2.164,272.3,0
5/31/2012,05:26,NaN,.9672,6.79572,1.518,277.7,0
5/31/2012,05:27,33.375,.98961,6.66360,1.733,274.9,0
5/31/2012,05:28,33.336,NaN,6.53622,2.671,275.8,0
5/31/2012,05:29,32.996,1.047,NaN,2.937,279.7,0
5/31/2012,05:30,33.317,1.0677,6.29475,2.911,285.9,0
5/31/2012,05:31,33.773,1.0909,6.18023,NaN,289.9,0
5/31/2012,05:32,34.345,NaN,6.06958,3.798,289.8,0
5/31/2012,05:33,34.714,1.1306,5.96262,NaN,289,0
5/31/2012,05:34,NaN,1.1531,5.85918,3.836,287.6,0
5/31/2012,05:35,35.674,1.1803,NaN,3.367,291.8,0
5/31/2012,05:36,NaN,1.1953,5.66220,3.367,NaN,0

j'aimerais estimer les valeurs qui sont manquantes (NaN) par la méthode " Maximum Likelihood = algorithme espérance-maximisation" .
Dans les pièces a joindre vous trouvez un fichier .m qui d’écrit l'algorithme EM, je sais pas en quoi je peu m'en servir !!


Merci d'avance à toutes personnes qui prendra le temps de lire et répondre a ce sujet.