[R] 0 rows> (or 0-length row.names)

[William Dunlap]

I see the printout (not an "error") that you describe on the 2nd example
you gave:

> t2 <- WOETable(X=SFDC1$case_age, Y=SFDC1$survey)
> print(t2)
[1] GOODS BADS  TOTAL PCT_G PCT_B WOE   IV
<0 rows> (or 0-length row.names)

The result of WOETable is perfectly legal - it is a data.frame with no rows.

help(WOETable) says that the 'X' argument should be a "categorical variable
stored as factor" but the function does not check that that is true.  You
gave it a numeric (continuous) variable, case_age, and it misbehaved.  You
can turn case_age into a factor with the cut() function.

Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Wed, Aug 31, 2016 at 3:37 AM, Shivi Bhatia <shivipmp82 at gmail.com> wrote:

> These are the packages i am using:
> library(woe)  #WEIGHT OF EVIDENCE
> library(InformationValue)  #INFORMATION VALUE
>
> The syntax used is :
> WOE(X=SFDC1$log_caseage, Y=SFDC1$survey)
> WOETable(X=SFDC1$case_age, Y=SFDC1$survey)
> IV(X=SFDC1$case_age, Y=SFDC1$survey)
>
> On Wed, Aug 31, 2016 at 12:54 AM, Mark Sharp <msharp at txbiomed.org> wrote:
>
>> Shivi,
>>
>> What package(s) are you using. What functions are you using. How are you
>> calling the functions. A reproducible sample has all of the actual code
>> needed to create a representative error. There are multiple packages you
>> could be using to look at weight of evidence and information value. For
>> example, there is a WOE function in the Information package and a woe
>> function in the woe package.
>>
>> Mark
>>
>> On Aug 30, 2016, at 2:15 PM, Shivi Bhatia <shivipmp82 at gmail.com> wrote:
>>
>> Hi Mark,
>> What i understand, probably when i run the WOE & IV to check significant
>> variables that is where i get this error. Thanks for your assistance Mark
>> really appreciate i will look into some other measure on this.
>>
>> On Wed, Aug 31, 2016 at 12:35 AM, Mark Sharp <msharp at txbiomed.org> wrote:
>>
>>> Shivi,
>>>
>>> It is likely that William knows what you are trying to do because of his
>>> considerable experience, but I am not able to figure it out from what you
>>> have written. You have apparently sent the output from something like
>>> dput(SFDC[1:50, ]), but I still do not know what you did to get the error.
>>>
>>> I successfully assigned the structure you sent to the name SFDC and
>>> nothing seems amiss.
>>>
>>>
>>> Mark
>>>
>>> R. Mark Sharp, Ph.D.
>>> Director of Primate Records Database
>>> Southwest National Primate Research Center
>>> Texas Biomedical Research Institute
>>> P.O. Box 760549
>>> San Antonio, TX 78245-0549
>>> Telephone: (210)258-9476
>>> e-mail: msharp at TxBiomed.org <msharp at txbiomed.org>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> > On Aug 30, 2016, at 12:32 PM, Shivi Bhatia <shivipmp82 at gmail.com>
>>> wrote:
>>> >
>>> > Hi William/ Mark,
>>> >
>>> > I am using WOE & IV (weight of evidence) reduce the number of
>>> independent
>>> > vars.
>>> > I have read this data as a csv file.
>>> > reproducible example for your reference please:
>>> >
>>> > structure(list(date = structure(c(6L, 6L, 6L, 6L, 6L, 6L, 14L,
>>> > 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L, 14L,
>>> >
>>> ... truncated
>>> > ______________________________________________
>>> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>>> > https://stat.ethz.ch/mailman/listinfo/r-help
>>> > PLEASE do read the posting guide http://www.R-project.org
>>> /posting-guide.html <http://www.r-project.org/posting-guide.html>
>>> > and provide commented, minimal, self-contained, reproducible code.
>>>
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