[R] explalinig the output of my linear model analysis

[Ista Zahn]

I've never seen the "/" used in a formula like that. What does it do?

-Ista

On Mon, Oct 26, 2009 at 8:13 AM, john56 <panatheod at gmail.com> wrote:
>
> Hi,
>
> I am new in statistics and i manage to make the linear model analysis but i
> have some difficulties in explaining the results. Can someone help me
> explalinig the output of my linear model analysis ? My data are with 2
> variables habitat (e,s) and treatment (a,c,p) with multiple trials within.
>
> Thank you in advance
>
> Call:
> lm(formula = a$wild ~ a$habitat/a$treatment/a$trial)
>
> Residuals:
>    Min      1Q  Median      3Q     Max
> -58.905 -19.958  -5.774  16.693  88.890
>
> Coefficients:
>                                Estimate Std. Error t value Pr(>|t|)
> (Intercept)                      55.4664     2.0332  27.281  < 2e-16 ***
> a$habitats                      -11.9615     2.8753  -4.160 3.26e-05 ***
> a$habitate:a$treatmentc           7.3581     2.8753   2.559  0.01054 *
> a$habitats:a$treatmentc          -4.9803     2.8753  -1.732  0.08335 .
> a$habitate:a$treatmentp         -13.9906     2.8753  -4.866 1.19e-06 ***
> a$habitats:a$treatmentp         -16.1311     2.8753  -5.610 2.17e-08 ***
> a$habitate:a$treatmenta:a$trial  -0.3204     0.3808  -0.841  0.40030
> a$habitats:a$treatmenta:a$trial  -0.1319     0.3808  -0.346  0.72905
> a$habitate:a$treatmentc:a$trial  -1.1250     0.3808  -2.954  0.00316 **
> a$habitats:a$treatmentc:a$trial  -0.4236     0.3808  -1.112  0.26608
> a$habitate:a$treatmentp:a$trial  -0.3021     0.3808  -0.793  0.42775
> a$habitats:a$treatmentp:a$trial  -0.2873     0.3808  -0.754  0.45072
> ---
> Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
>
> Residual standard error: 26.8 on 3588 degrees of freedom
> Multiple R-squared: 0.1383,     Adjusted R-squared: 0.1357
> F-statistic: 52.35 on 11 and 3588 DF,  p-value: < 2.2e-16
>
> --
> View this message in context: http://www.nabble.com/explalinig-the-output-of-my-linear-model-analysis-tp26058610p26058610.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.
>



-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org