try sampling the 'indices' and then using them to get the subset:

> x.in
    dirn   county year exp exp.wave r3
1  43901 Cuyahoga 2006   0        0 56
2  49098 Pickaway 2006   0        0 77
3  44164  Portage 2006   0        0 85
4  44610    Wayne 2006   1        1 76
5  45120    Wayne 2006   0        0 82
6  49593   Scioto 2006   1        1 89
7  46516 Crawford 2006   0        0 75
8  50054   Summit 2006   0        0 92
9  48231    Lucas 2006   0        0 79
10 49908    Stark 2006   0        0 90
> x.in[sample(seq(nrow(x.in)), 5),]
    dirn   county year exp exp.wave r3
8  50054   Summit 2006   0        0 92
6  49593   Scioto 2006   1        1 89
1  43901 Cuyahoga 2006   0        0 56
2  49098 Pickaway 2006   0        0 77
10 49908    Stark 2006   0        0 90
>



On 3/8/07, Anirudh V. S. Ruhil <ruhil@ohio.edu> wrote:
>
> Folks,
>
> I have a dataframe (snippet shown below).
>
> >  demo.df[1:10, 1:6]
>    dirn   county year exp      exp.wave        r3
> 1  43901 Cuyahoga 2006    0         0 56
> 2  49098 Pickaway 2006    0         0 77
> 3  44164  Portage 2006    0         0 85
> 4  44610    Wayne 2006    1         1 76
> 5  45120    Wayne 2006    0         0 82
> 6  49593   Scioto 2006    1         1 89
> 7  46516 Crawford 2006    0         0 75
> 8  50054   Summit 2006    0         0 92
> 9  48231    Lucas 2006    0         0 79
> 10 49908    Stark 2006    0         0 90
>
> If I need to draw all possible samples of size n (where n = 30, n = 50,
> and
> so on), and run a particular linear model on each subsample of a specific
> size, then tabulate coeffs on specific covariates for subsequent
> manipulation/graphical representation, what would be the best means of
> doing so?
>
> "sample.1 <- sample(demo.df, 30, replace = FALSE)"
>
> doesn't work; it just gives me the entire population in demo.df. What am I
> missing?
>
> thanks in advance
>
> Ani
>
> Anirudh V. S. Ruhil, Ph.D.
> Sr. Research Associate
> Voinovich Center for Leadership and Public Affairs
> Ohio University
> Building 21, The Ridges
> Athens, OH 45701-2979
> Tel: 740.597.1949 | Fax: 740.597.3057
>
> ______________________________________________
> R-help@stat.math.ethz.ch 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.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

	[[alternative HTML version deleted]]

