[R] Bootstrapping in R

ruipbarradas at sapo.pt ruipbarradas at sapo.pt
Sat Oct 1 11:49:30 CEST 2016


Sorry, but what formula? formula is not a ?boot argument.
To the OP: Michael is probably right, if you reset the seed each time,  
you'll get equal values, otherwise you should get different results  
due to randomization.

Rui Barradas


Quoting Christoph Puschmann <c.puschmann at student.unsw.edu.au>:

> Dear Bryan,
>
> Did you try to include formula in the boot command? like:
>
> results <- boot(data, statistic, R, formula)
>
> All the best,
>
> Christoph
>
>> On 1 Oct 2016, at 19:24, Michael Dewey <lists at dewey.myzen.co.uk> wrote:
>>
>> Dear Bryan
>>
>> You are not resetting the seed each time by any chance?
>>
>> Michael
>>
>> On 01/10/2016 02:44, Bryan Mac wrote:
>>> Hi,
>>>
>>> I have read the help page and it was helpful but, I am having  
>>> concerns because each time I run this code I get the same value.
>>> I expected that each time I run the code, I will get different  
>>> values due to random sampling.
>>>
>>> How do I get this randomization? The values shouldn’t be the same  
>>> each time the code is run, correct?
>>>
>>>
>>> result <- boot(n_data, statistic = DataSummary, R = 100).
>>>
>>>
>>> Best,
>>>
>>> Bryan Mac
>>> bryanmac.24 at gmail.com
>>>
>>>
>>>
>>>> On Sep 29, 2016, at 12:16 PM, ruipbarradas at sapo.pt wrote:
>>>>
>>>> Hello,
>>>>
>>>> Read the help page ?boot::boot.
>>>> For instance, try the following.
>>>>
>>>>
>>>> library(boot)
>>>>
>>>> x <- rnorm(100)
>>>> stat <- function(x, f) mean(x[f])
>>>> boot(x, stat, R = 100)
>>>>
>>>> Hope this helps,
>>>>
>>>> Rui Barradas
>>>>
>>>>
>>>>
>>>> Citando bryan.mac24 <bryan.mac24 at gmail.com>:
>>>>
>>>>> Hi all,
>>>>> I am wondering how to conduct bootstrapping in R. I need  
>>>>> bootstrap 100 times. The trick I need to figure out is how to do  
>>>>> get a random sample of 100 out of the total number of case.
>>>>> Best,
>>>>> BM
>>>>> 	[[alternative HTML version deleted]]
>>>>>
>>>>> ______________________________________________
>>>>> 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
>>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>>
>>>>
>>>
>>>
>>> 	[[alternative HTML version deleted]]
>>>
>>> ______________________________________________
>>> 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
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>
>> --
>> Michael
>> http://www.dewey.myzen.co.uk/home.html
>>
>> ______________________________________________
>> 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
>> and provide commented, minimal, self-contained, reproducible code.



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