# Re: [R] extracting Pr>ltl from robcov/ols (Design)

From: Mark Difford <mark_difford_at_yahoo.co.uk>
Date: Fri, 25 Jul 2008 06:40:57 -0700 (PDT)

ldb (?),

```>> I am trying to extract significance levels out of a robcov+ols call....
>> However, I can't figure out how to get to the significance (Pr>ltl).
>> It is obviously calculating it because the call:

```

It's calculated in print.ols(). See extract below. To see the whole function, do

print.ols

## Extract from print.ols in package Design se <- sqrt(diag(x\$var))

z <- x\$coefficients/se
P <- 2 * (1 - pt(abs(z), rdf))
co <- cbind(x\$coefficients, se, z, P)     dimnames(co) <- list(names(x\$coefficients), c("Value", "Std. Error",

"t", "Pr(>|t|)"))
print(co)

HTH, Mark.

ldb-5 wrote:
>
> I am trying to extract significance levels out of a robcov+ols call.
>
> For background: I am analysing data where multiple measurements(2 per
> topic) were taken from individuals(36) on their emotional reaction
> (dependent variable) to various topics (3 topics). Because I have
> several emotions and a rotation to do on the topics, I'd like to have
> the results pumped into a nice table.
>
> answer<-robcov(ols(emotion ~ topic,x=TRUE,y=TRUE),individual)
>

```>>From the robcov help it warns me:
```

>

>>Adjusted ols fits do not have the corrected standard errors printed with print.ols. Use sqrt(diag(adjfit\$var)) to get this, where adjfit is the result of robcov.
>
> So I can get to the standard error by:
>
>
> I can get to the coefficients by:
>
>
> I can get to the t-values by:
>
>
> However, I can't figure out how to get to the significance (Pr>ltl).
> It is obviously calculating it because the call:
>
>
> provides it, but I can't figure out where it is getting it from or how
> it is calculating.
>
> thanks for any help.
>
> ldb
>
> ______________________________________________
> 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.
>
>
```--
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```
Received on Fri 25 Jul 2008 - 13:51:38 GMT

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