[R-meta] Subgroup analyses
d@v|d@c|cchett| @end|ng |rom @tudent@un|-tueb|ngen@de
Wed Aug 25 14:19:02 CEST 2021
Thank you for the links, they seem to solve my issue.
Quoting Philippe Tadger <philippetadger using gmail.com>:
> Dear David
> You can see answer to your question here:
> I would not substract the intercept, in most of the cases is a
> strong assumption.
> On 25/08/2021 12:55, David Cicchetti wrote:
>> Dear list members,
>> I am trying to run subgroup analyses in my meta analysis. I have
>> the issue that I do not know whether I should include an intercept
>> or not, meaning whether I should do mods = ~ Coil.Type (with
>> intercept) or mods = ~ Coil.Type - 1 (without intercept).
>> From what I know so far we can leave out the intercept if for x = 0
>> -> y = 0. Unfortunately I don't think that logic applies here. My
>> variables (as for example Coil Type) do not have a 'zero'
>> condition, it compares for example Coil A with Coil B.
>> If I want to write down the values as a table, I cannot do that
>> well when including the intercept because then the estimate,
>> standard error and CI are from the difference to the intercept and
>> not from the level itself.
>> Since the Moderator tests become more easily significant when
>> excluding the intercept, I was hesitant to do so. Therefore I would
>> be thankful if anyone could clear me up on when/if I am allowed to
>> get rid of the Intercept in my case.
>> Thanks in advance.
>> R-sig-meta-analysis mailing list
>> R-sig-meta-analysis using r-project.org
> Kind regards/Saludos cordiales
> *Philippe Tadger*
> ORCID <https://orcid.org/0000-0002-1453-4105>, Reseach Gate
> Phone/WhatsApp: +32498774742
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