[R-meta] mods~factor

[angelo solarino]

Wolfgang,

thanks again for your time.
when running the metaregression with a categorical variable (field) I
should see the levels of the variable in the regression output with the
following labels: Etrep; Finance, IB, and Manag.

the code used:

> res <- rma(yi,vi, mods ~ field, data=cells, method = "HS")> res
Random-Effects Model (k = 122; tau^2 estimator: HS)

tau^2 (estimated amount of total heterogeneity): 0.0037 (SE = 0.0010)
tau (square root of estimated tau^2 value):      0.0612
I^2 (total heterogeneity / total variability):   87.69%
H^2 (total variability / sampling variability):  8.12

Test for Heterogeneity:
Q(df = 121) = 1015.5701, p-val < .0001

Model Results:

estimate      se    zval    pval    ci.lb   ci.ub
  0.0025  0.0065  0.3821  0.7024  -0.0103  0.0153

---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1


the examples work just fine, with other datasets , it works as well.
so I'm trying to understand what is different here and why I am getting
neither the expected results nor an error message.

any hint is welcome!
Thanks again,

Angelo


Il giorno mar 29 giu 2021 alle ore 16:15 Viechtbauer, Wolfgang (SP) <
wolfgang.viechtbauer using maastrichtuniversity.nl> ha scritto:

> Please always cc the mailing list when responding.
>
> You haven't actually stated what the problem is. What exactly do you mean
> by "I can't get the factors in the metaregression"? What error do you get?
> Or what is the output that you get that is not in accordance with what you
> were expecting?
>
> Best,
> Wolfgang
>
> >-----Original Message-----
> >From: angelo solarino [mailto:angelosolarino using gmail.com]
> >Sent: Tuesday, 29 June, 2021 17:03
> >To: Viechtbauer, Wolfgang (SP)
> >Subject: Re: [R-meta] mods~factor
> >
> >Dear Wolfgan,
> >
> >thank you for your quick reply.
> >
> >Unfortunately, I still can't get the factors in the metaregression. In
> other
> >projects with metafor, it never encountered this issue before, so i am
> not certain
> >what is causing it.
> >
> >I have re-started the project in a new space after having updated R,
> Rtools, and
> >metafor to the most recent versions. The issue persists.
> >Have you ever encountered this issue before? all the other parts works,
> it just
> >the meta regressions that is causing some troubles.
> >
> >Thanks a lot for having developed such a great tool, and let me know if
> you have
> >any advice on how to overcome this problem.
> >All the best,
> >Angelo
> >
> >Il giorno mar 29 giu 2021 alle ore 12:10 Viechtbauer, Wolfgang (SP)
> ><wolfgang.viechtbauer using maastrichtuniversity.nl> ha scritto:
> >Dear Angelo,
> >
> >The factor() function is not something from metafor, but is part of R
> itself.
> >
> >String variables are automatically converted to factors, so using
> factor() on them
> >doesn't change anything.
> >
> >As for the interpretation of results when including factor variables in
> models,
> >see:
> >
> >
> https://www.metafor-project.org/doku.php/tips:models_with_or_without_intercept
> >
> >Best,
> >Wolfgang
> >
> >>-----Original Message-----
> >>From: R-sig-meta-analysis [mailto:
> r-sig-meta-analysis-bounces using r-project.org] On
> >>Behalf Of angelo solarino
> >>Sent: Tuesday, 29 June, 2021 12:21
> >>To: r-sig-meta-analysis using r-project.org
> >>Subject: [R-meta] mods~factor
> >>
> >>DA,
> >>
> >>I am having some trouble with the "factor" command in metafor.
> >>I am not able to get the split for the variable field. it is a string
> >>value. whether i add "mods~factor(field)"  or not I get the same main
> >>effect results, and there is no error message. Can anyone help me figure
> >>out what I am doing wrong?
> >>
> >>res <- rma(yi,vi, mods~factor(field), data=Outcomes1, method = "HS",
> >>subset=(ID=="XX" | ID=="XY"))
> >>
> >>Thanks a lot for your help,
> >>Angelo
>

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