[R] Not able to filter factor, class

[John Kane]

Are you sure that you are not confusing the number of levels with the length of the vector?

John Kane
Kingston ON Canada


> -----Original Message-----
> From: balanagudevarayulu at gvkbio.com
> Sent: Tue, 14 Aug 2012 12:40:26 +0000
> To: r-help at r-project.org
> Subject: [R] Not able to filter factor, class
> 
> After importing data from Excel through ODBC.
> In the inclusion dataset, class(inclusion$Value) is coming as factor.
> After filtering the data, length(inclusion$Value == 0),the answer is
> coming as 4879, but actually Value contains only 225 rows. So how can I
> get the length as 225.
> Can anyone help?
> 
> setwd("D:/AZ")
> library("RODBC")
> cdb_cnct <-
> odbcConnectExcel("AZIF_DC_GVK_NSCLC_MSALL_287papers_02072012_141450_v1_4.xls")
> arm <- sqlFetch(cdb_cnct, "Arm")
> inclusion <- sqlFetch(cdb_cnct, "Inclusion")
> odbcClose(cdb_cnct)
> rm(cdb_cnct)
> names(inclusion)
> [1] "Trial_Design_ID"    "Reference_ID"       "Inclusion_Criteria"
> [4] "Value"              "F5"                 "F6"
>> class(inclusion$Value)
> [1] "factor"
> 
>> nrow(inclusion)
> [1] 4879
>> length(inclusion$Value == 0)
> [1] 4879
>> length(inclusion$Value == "0")
> [1] 4879
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