[R] SPSS F-test on change in R square between hierarchical models

[Bert Gunter]

Probably

?anova
?add1
?drop1

are what you're looking for.

-- Bert


On Wed, Nov 23, 2011 at 6:07 AM, Christopher Desjardins
<desja004 at umn.edu> wrote:
> Hi,
>
> I am wondering if anyone knows how to perform an F-test on the change in R
> square between hierarchical models in R? SPSS provides this information and
> a researcher that I am working with is interested in getting this
> information. Alternatively, if someone knows how I can calculate the test
> statistic (SPSS calls it F-change?) and dfs that would be helpful as well.
>
> The output and the test I am looking for is available here ->
> http://dl.dropbox.com/u/1501309/spss_rsquared.pdf
>
> Chris
>
> On Wed, Nov 23, 2011 at 6:20 AM, Smart Guy <smartguy3k at gmail.com> wrote:
>
>> Hi All,
>>           I was adding a new row of data to my data frame using rbind(). I
>> was surprised to see that after adding new row, I lost my data frame level
>> attibute as well as  col level attribute. Please help me to insert a new
>> row at frist or middle position so that my custom attribute is not lost.
>>
>>  Here is what I did.
>>
>> age<-c(15,20,18)
>> weight<-c(40,42,30)
>>
>> ### creating my data frame ####
>> mydata <- data.frame(age,weight)
>>
>> ### creating data frame level attribute ####
>> attr(mydata,"myattr")<-c("myinfo")
>>
>> ### creating col level attribute for 'age' column  ###
>> attr(mydata$age,"mycolattr")<-c("mycolinfo")
>>
>> #### Checking attributes  ###
>> attributes(mydata)
>> attributes(mydata$age)
>>
>> ### creating new row  #####
>> newrow <- data.frame(age=16, weight= 42)
>>
>> #### Inserting newrow as first row to my data frame ####
>> mydata<- rbind(newrow, mydata)
>>
>> #### Checking attributes again ###  I lost my custom attributes
>> attributes(mydata$age)
>> attributes(mydata)
>>
>>
>> Thanks in advance,
>>
>>
>> --
>> SG
>>
>>        [[alternative HTML version deleted]]
>>
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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Phone: 467-7374
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