[R-meta] Fwd: help(Missing data for moderator variables in metareg function)

[Yalemzewod Gelaw]

Dear colleagues,
As usual, I am looking your help. Thank you for the metafor package.
I am doing metareg for dealing with the source of heterogeneity. The moderator (mean age) has missing values: 22 studies out of 68 didn’t report the mean age of the study group. Whn I ran the model the error message displayed as below;
3.6         35.4        28.4        32           37.6        39           1.05        31.75     NA          NA          NA          NA          NA          32           37.8               34.9        NA          30           30.5        29.8        35           30          24.8        32.7        35           NA          28.7        34.2        NA               34.9        28           28           31.3        NA          35           Na          35           NA          28.5        38.1        NA          NA          33.3               34.2        6.2          NA          25.5        33.4        32.6        29.5       NA          42           37.2        33.7        NA          8.5          39.5               NA          NA          NA          NA          NA          26.6        35.2       NA          33.3        8.5          35
ress <- rma(yi,vi,mods = ~meanage_year, data = datz)
Warning message:
In rma(yi, vi, mods = ~meanage_year, data = datz) :
 Studies with NAs omitted from model fitting.
So, my question is what functions of metafor do help to impute this missing values. I wonder if you can also provide examples done before.

Sincerely,

Yalemzewod Assefa Gelaw  (Yalem)
Ph.D.Candidate, the University of Queensland, Australia
Email: yalassefa at gmail.com<http://yalassefa@gmail.com/y.gelaw@uq.edu.au>

"
Change is good ... but it hurts "




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