what does 'str' of the object show? are the columns factors/characters? does
the comparison have to consider the date?
Sent from my iPad
On Feb 27, 2012, at 0:37, Edgar Alminar <eaalmi...@ucsd.edu> wrote:
> Oh, haha -- sorry for the vagueness:
>
> I was expecting to get the comparison to work. I also didn't mention that the
> dataset is much larger; I just wanted to give the first few rows.
>
> So, basically, I have a bunch of times in three columns, and I'm looking to
> compare them in which the command works correctly.
>
> Let's say, using the example below, that I want to get:
>
>>> match2 = subset(match2, AEONTIME < INFTIME.x)
>
> Well, with that exact syntax, it's not working because I'm getting back a
> dataset in which some AEONTIMEs are actually > INFTIME.x.
>
> So, I feel like I'm just missing a piece of the syntax (i.e. as.date,
> as.character, but what works for time?)
>
> I hope this helps. :-)
>
> Thanks!
>
>
> On Feb 26, 2012, at 9:32 PM, David Winsemius wrote:
>
>>
>> On Feb 26, 2012, at 10:31 PM, Edgar Alminar wrote:
>>
>>> Hello All,
>>> I have this dataset:
>>>
>>> RID VISCODE SCRNO RECNO AEWHEN AEONDATE AEONTIME INFPOINT.x
>>> INFDATE.x INFTIME.x INFPOINT.y INFDATE.y INFTIME.y
>>> 1 100 w00 IGI1480069 4 2 09/15/2009 1118 1
>>> 09/15/2009 947 14 -4 1117
>>> 2 100 w00 IGI1480069 8 2 09/15/2009 1132 1
>>> 09/15/2009 947 14 -4 1117
>>> 3 100 w00 IGI1480069 5 2 09/15/2009 1125 1
>>> 09/15/2009 947 14 -4 1117
>>>
>>>
>>>
>>> I have AEONTIME, INFTIME.x, and INFTIME.y, and they are all military times.
>>> I'm trying to do a comparison like this:
>>>
>>> match2 = subset(match2, AEONTIME < INFTIME.x)
>>>
>>> But it's not working correctly.
>>
>> Define what you expected. In the sample you offered none of those logical
>> comparisons would be true so you should get a dataframe with zero rows. (And
>> since you gave the result the same name, you have basically wiped out
>> match2.)
>>
>>
>>> How do I do this? :-)
>>
>> Do what?
>>
>> --
>>
>> David Winsemius, MD
>> Heritage Laboratories
>> West Hartford, CT
>>
>
> Edgar Alminar
> Clinical Operations
> Alzheimer's Disease Cooperative Study
> University of California, San Diego
> 9500 Gilman Drive, MC-0949
> La Jolla, CA 92093-0949
> Tel: (858) 622-8798
> Fax: (858) 622-5876
> Email: eaalmi...@ucsd.edu
>
> Confidentiality Notice- This e-mail message from the Alz...{{dropped:11}}
>
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