[R] invalid type (list) for variable

[Michael Hecker]

Hi Jannis,
thank you very much for your help. After conversion to factor everything 
is working fine.


Michael

Am 26.02.2011 20:32, schrieb Jannis:
> Michael,
>
>
> i have no experience with the Bayesian models you use, but I could 
> imagine that the problem is that this classifiedPositive variable is a 
> list (as you suggest as well). With
>
> unlist()
> as.character()
> as.factor()
>
> you can convert the variable to anything you may need as an input.
>
>
> HTH
> Jannis
> On 02/26/2011 12:40 PM, Michael Hecker wrote:
>> Hi,
>> I have a problem with an invalid variable type.
>>
>> My sample dataset is looking like this:
>> >  str(factivaTDM.train)
>> 'data.frame':   4 obs. of  14 variables:
>>    $ access            : num  2 3 2 1
>>    $ billion           : num  2 1 2 2
>>    $ compani           : num  7 6 1 2
>>    $ data              : num  6 2 3 4
>>    $ inc               : num  5 3 3 2
>>    $ local             : num  3 2 1 1
>>    $ mcleodusa         : num  15 6 2 10
>>    $ network           : num  9 1 2 1
>>    $ provid            : num  4 3 1 2
>>    $ servic            : num  11 4 3 6
>>    $ share             : num  9 5 3 5
>>    $ splitrock         : num  18 6 4 5
>>    $ stock             : num  3 3 1 2
>>    $ classifiedPositive:List of 4
>>     ..$ : chr "yes"
>>     ..$ : chr "yes"
>>     ..$ : chr "yes"
>>     ..$ : chr "yes"
>>     ..- attr(*, "class")= chr "AsIs"
>>
>> and the command:
>> NaiveBayes.model<- NB(classifiedPositive ~ ., data = factivaTDM.train)
>> generates the error:
>> invalid type (list) for variable 'classifiedPositive'
>>
>> Here is another dataset which causes no errors:
>> >  str(weatherNominal.train)
>> 'data.frame':   13 obs. of  5 variables:
>>    $ outlook    : Factor w/ 3 levels "overcast","rainy",..: 3 3 1 2 2 
>> 2 1
>> 3 3 2 ...
>>    $ temperature: Factor w/ 3 levels "cool","hot","mild": 2 2 2 3 1 1 
>> 1 3
>> 1 3 ...
>>    $ humidity   : Factor w/ 2 levels "high","normal": 1 1 1 1 2 2 2 1 
>> 2 2 ...
>>    $ windy      : logi  FALSE TRUE FALSE FALSE FALSE TRUE ...
>>    $ play       : Factor w/ 3 levels "?","no","yes": 2 2 3 3 3 2 3 2 
>> 3 3 ...
>>
>> So I suppose, I have to convert classifiedPositive:List to
>> classifiedPositive:Factor
>> How can I do that?
>>
>> I will send you more information about my script if you need it.
>>
>> Thank you very much,
>> Michael
>>
>>
>>     [[alternative HTML version deleted]]
>>
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>
>