[R-meta] Observed effect size using escalc

[Michael Dewey]

Dear Brett

It calculates it using one of dozens of formulae depending on what sort 
of input you gave it. If you show us the code you have inherited we can 
probably help further. The help ?escalc does have wagon-loads of detail 
about this if you want to probe further.

When you do post code please set your e-mailer to send plain text as 
HTML gets mangled in transmission and can make you message unreadable.

On 11/08/2017 16:21, Myers, Brett wrote:
> Hello,
>
>
>
> I am new to the metafor package and I am trying to decipher someone else's code. I'm specifically curious about the "yi" variable associated with the escalc() function. It appears that the yi vector is an output variable that escalc() appends to the dataset. The metafor documentation says that yi is the observed effect size, and we didn't enter this as an input variable, so I'm wondering what formula escalc() uses to determine yi. Would anyone here have some insight on how yi is calculated?
>
>
>
> Thanks,
>
> Brett Myers
>
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html