Hello Shyam,
if your data is stored in variable "dataset", for example, the following
code will create the desired dummy-coded variables and attach them to the
dataset:
######################
#init vars
SWHE=BARL <- vector(length=nrow(dataset))
SWHE[]=BARL[] <- 0 #initialize dummy-coded vars with all 0s
#fill in variables
SWHE[grep("SWHE", dataset$crop)] <- 1 #grep returns the indices where a
match is found, see ?grep
BARL[grep("BARL", dataset$crop)] <- 1
#attach new dummy codes to dataset
dataset$SWHE <- SWHE
dataset$BARL <- BARL
######################
Hope this helps,
Patrick
2013/4/20 shyam basnet <shyamabc2...@yahoo.com>
> Hello R-users,
>
> The below is a snippet of my data:
>
>
> fid crop year value
> 5_1_1 SWHE 1995 171
> 5_1_1 SWHE 1997 696
> 5_1_1 BARL 1996 114
> 5_1_1 BARL 1997 344
> 5_2_2 SWHE 1995 120
> 5_2_2 SWHE 1996 511
> 5_2_2 BARL 1996 239
> 5_2_2 BARL 1997 349
>
> Here, I want to create dummy variables with the names of the content of a
> column 'crop' in a way that the new variable 'SWHE' would receive a value
> of 1 if the column 'crop' contains 'SWHE' and 0 otherwise. So, I would have
> two new variables SWHE and BARL as below:
>
>
> fid crop year value SWHE BARL
> 5_1_1 SWHE 1995 171 1 0
> 5_1_1 SWHE 1997 696 1 0
> 5_1_1 BARL 1996 114 0 1
> 5_1_1 BARL 1997 344 0 1
> 5_2_2 SWHE 1995 120 1 0
> 5_2_2 SWHE 1996 511 1 0
> 5_2_2 BARL 1996 239 0 1
> 5_2_2 BARL 1997 349 0 1
>
>
> Cheers,
> Shyam
> Nepal
> [[alternative HTML version deleted]]
>
>
> ______________________________________________
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>
>
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