[R] RWeka: How to access AttributeEvaluators

2009-04-26 Thread Michael Olschimke
Hi,

I'm trying to use Information Gain for feature selection.

There is a InfoGain implementation in Weka:

*weka.attributeSelection.InfoGainAttributeEval*

Is it possible to use this function with RWeka? If yes how?
list_Weka_interfaces doesn't show it and there is no make function for
AttributeEvaluators.

Is there any other implementation of InformationGain in R?

Thank you

Michael Olschimke
MSIS Graduate Student
Santa Clara University

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[R] RWeka: How to access AttributeEvaluators

2009-04-22 Thread Michael Olschimke
Hi,

I'm trying to use Information Gain for feature selection.

There is a InfoGain implementation in Weka:

*weka.attributeSelection.InfoGainAttributeEval*

Is it possible to use this function with RWeka? If yes how?
list_Weka_interfaces doesn't show it and there is no make function for
AttributeEvaluators.

Is there any other implementation of InformationGain in R?

Thank you

Michael Olschimke
MSIS Graduate Student
Santa Clara University


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[R] RWeka: How to access AttributeEvaluators

2009-04-22 Thread Michael Olschimke
Hi,

I'm trying to use Information Gain for feature selection.

There is a InfoGain implementation in Weka:

*weka.attributeSelection.InfoGainAttributeEval*

Is it possible to use this function with RWeka? If yes how?
list_Weka_interfaces doesn't show it and there is no make function for
AttributeEvaluators.

Is there any other implementation of InformationGain in R?

Thank you

Michael Olschimke
MSIS Graduate Student
Santa Clara University


[[alternative HTML version deleted]]

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[R] Execute script and go interactive

2009-02-27 Thread Michael Olschimke
Hi,

is it possible to execute a script with R and go into interactive mode
with the same session?

e.g.

R  myscript.R
objects()

Creating a .Rprofile is not an option for me.

Thank you

Michael

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Re: [R] How do I get my IT department to bless R?

2009-01-29 Thread Michael Olschimke
Could you please share a link to the NY Times article? Is it about OSS
in general or specific to R?

Thanks

Michael

Michael Bibo wrote:
 Daniel Viar dan.viar at gmail.com writes:

   
 I currently use R at work under the radar, but there's a chance I
 could loose that access.  I'd like to get our company to feel
 comfortable with open source and R in particular.  Does anyone have
 any experience with their company's IT department and management that
 they would be willing to share?  How does one get an all Microsoft
 shop on board with allowing users to user R?  I know about the recent
 NY Times article and recent news.  I'm afraid I may need some case
 studies or examples of what other companies have done.

 Any help would be greatly appreciated.

 Thanks
 Dan Viar
 Chesapeake, VA

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 Just my opinions from my own experience...

 Don't talk to just anyone in your IT department, but try to identify someone 
 who a) has some authority/decision-making power; and b) is likely to be 
 somewhat OSS knowledgable/tolerant/keen.

 Go through proper procedures.  In my organisation, there is a specific 
 process 
 for approval of software.  I filled in appropriate forms and provided 
 supporting documentation such as:

 http://www.r-project.org/doc/R-FDA.pdf
 copy of the GPL and references such as http://www.groklaw.net/article.php?
 story=2008081313212422
 R installation and administration manual
 NY Times article

 I also made futher points about the extensive use of R in peer-reviewed 
 journals such as JSS, and the superiority of the email help list and archives 
 over the support offered for most proprietary products (with specific 
 examples).

 Most of this is to make it abundantly clear that you are talking about a 
 quality, open-source product, not some small piece of freeware developed by 
 an 
 individual.

 I have found two main types of IT concerns.  Firstly, they are appropriately 
 concerned about licensing issues.  You need to reinforce that, though free, 
 it 
 is licensed - under the GPL.  Secondly, they may have concerns simply because 
 it is not the existing/approved/supported norm in your organisation.  I have 
 found that it is important here to make it clear that you will not be 
 expecting them to 'support' the software in the sense of helping you learn to 
 use it (which is often the case for office-type software and its users in 
 organisations).

 And if all else fails, and your organisation's policies refer to 'installing' 
 software, you can always run it portably, even from an external drive (at 
 least in a Windows environment).

 Ultimately, though, I think the thing that helped most to convince our IT 
 department to let me try R was when they themselves had the nightmare of 
 dealing with the licensing and accounts division of a certain well-known 
 statistical package proprietor.

 Michael Bibo
 Queensland Health

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