On 07/09/2011 08:16 PM, Rosana Ferrero wrote:
Hi!
I want to do a meta-analysis with count data for treatement/control cases.
Mi problem is that I need to use zero values (an informative value) for the
mean and standard deviation for one of the treatement, but R has a
problem: "Studies
with zero values for sd.e or sd.c get no weight in meta-analysis". I can
agroup the case by Family (byvar=Family).
Hi Rosana,
Your data indicates that in three studies, whatever was being measured
had a value of zero for each of the three spaghetti worms in the
treatment group. Maybe they were dead or something. You may be able to
get away with substituting a very small value (0.1 or something) for the
SD in these cases. However, I would look very carefully at what this
means. If, say, the worms are dead, is the measurement between live and
dead worms meaningful? Just a guess.
Jim
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