Redes Bayesianas
Redes Bayesianas
Redes Bayesianas
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9. Selección de variables en microarrays de ADN<br />
• Dos bases de datos de expresión genética<br />
• Cancer de colon (Ben–Dor et al., 2000)<br />
n = 2000, R = 62, C = { si, no }<br />
• Leucemia (Golub et al., 1999)<br />
n = 7129, R = 72, C = { AML, ALL }<br />
• Naïve–Bayes<br />
• Variables predictivas discretas:<br />
X i =<br />
⎧<br />
⎨<br />
⎩<br />
0 si x i ≤ mediana,<br />
1 si x i > mediana<br />
• Variables predictivas continuas:<br />
para todo i = 1, . . . , n y c: f Xi | C=c(x i | c) ❀ N (µ c i , σc i )<br />
<strong>Redes</strong> <strong>Bayesianas</strong> – p.80/91