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Codificación disyuntiva completa.
La codificación disyuntiva completa es utilizada en análisis de datos. Permite transformar variables cualitativas en variables de tipo cuantitativo entre las cuales está permitido calcular correlaciones.
Ejemplo :
|
Temperatura (°)
|
Vanadium (gramos)
|
Abastecedor n °
|
Rigidez
|
Prueba 1
|
103
|
21
|
1
|
19
|
Prueba 2
|
115
|
28
|
2
|
25
|
Prueba 3
|
99
|
28
|
3
|
21
|
Prueba 4
|
102
|
23
|
1
|
22
|
Prueba 4
|
97
|
25
|
3
|
24
|
La columna Abastecedor no puede ser dejado tal cual. Los números que contiene no son unas medidas en una unidad dada, sino números arbitrarios. No tenemos el derecho a calcular el coeficiente de correlación entre la columna abastecedor y otra columna. Debemos primero ventilar esta variable "cualitativa" en tres variables indicadoras de tipo presencia-ausencia, como más abajo (codificación " disyuntivo completo ")
|
Temperatura (°)
|
Vanadium (gramos)
|
A1
|
A2
|
A3
|
Rigidez
|
Prueba 1
|
103
|
21
|
1
|
0
|
0
|
19
|
Prueba 2
|
115
|
28
|
0
|
1
|
0
|
25
|
Prueba 3
|
99
|
28
|
0
|
0
|
1
|
21
|
Prueba 4
|
102
|
23
|
1
|
0
|
0
|
22
|
Prueba 4
|
97
|
25
|
0
|
0
|
1
|
24
|
Ahora está permitido calcular las correlaciones dos a dos entre las columnas de la tabla.
- Benzécri J.-P. et al. (1976), L'analyse des données, París, Dunod
- Michel Volle, Analyse des données, Economica, édition Economica, 1997 - ISBN|2717832122
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Codificación disyuntiva completa
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