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Factores R

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Factores R

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Played 3 %Accuracy 192 Average time 05:59
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Factores

Created by

María Dolores 1 Lage Veiga
María Dolores 1 Lage Veiga
Spain

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Factores ROnline version

Factores

by María Dolores 1 Lage Veiga
1

categóricos descriptivas factor auto vector expresamente datos etiquetas indicarlo codificado otro estructura automáticamente

Factores :
Utilizar factores con es preferible a utilizar enteros porque las etiquetas son - .
Supongamos que el sexo indica el sexo de un persona como 0 si hombre y 1 si mujer
sexo < - c ( 0 , 1 , 1 , 1 , 0 , 0 , 1 , 0 , 1 )
sexo
## [ 1 ] 0 1 1 1 0 0 1 0 1
table ( sexo )
## sexo
## 0 1
## 4 5
guardaremos los datos en una tipo :
sexo2 < - factor ( sexo , labels = c ( " hombre " , " mujer " ) ) ; sexo2
## [ 1 ] hombre mujer mujer mujer hombre hombre mujer hombre mujer
## Levels : hombre mujer
levels ( sexo2 ) # devuelve los niveles de un factor
## [ 1 ] " hombre " " mujer "
unclass ( sexo2 ) # representación subyacente del factor
## [ 1 ] 1 2 2 2 1 1 2 1 2
## attr ( , " levels " )
## [ 1 ] " hombre " " mujer "
table ( sexo2 )
## sexo2
## hombre mujer
## 4 5
Veamos otro ejemplo , en el que inicialmente tenemos . Los niveles se toman por orden alfabético
respuestas < - factor ( c ( 'si' , 'si' , 'no' , 'si' , 'si' , 'no' , 'no' ) )
respuestas
## [ 1 ] si si no si si no no
## Levels : no si
Si deseásemos orden ( lo cual puede ser importante en algunos casos , por ejemplo para representaciones gráficas ) , habría que
respuestas < - factor ( c ( 'si' , 'si' , 'no' , 'si' , 'si' , 'no' , 'no' ) , levels = c ( 'si' , 'no' ) )
respuestas
## [ 1 ] si si no si si no no
## Levels : si no

 
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