I would like to conduct a moderator analysis looking at the effects of six different moderators on the relationship between anxiety in children with dyslexia. The number of studies included in this review is small (N=14) and the number of effect sizes that would be included in each "moderator analysis" is 3-4 at most per moderator. I am reluctant to interpret the data using narrative synthesis as I would like to add weight to my conclusions using statistical data. But my question is, is it meaningful to conduct moderator analyses using such few effect sizes? I have a rule of thumb suggesting 10 studies per moderator should be included, but this estimate still seems conservative?

Any suggestions on this would be greatly appreciated.

Thanks,

d ]]>

I'm a newbie here. I need help on how to find mean and standard deviation for a lognormal distribution. I've been searching on the internet but cant find the answer.

Here is my question.

Let say

X = b x c x sqrt(d)

and b is assumed to follow lognormal distribution with mean 1.26 and standard deviation 0.33.

c is a constant which is equal to 1.392

and d is also follow lognormal distribution with mean 0.833 and standard deviation 0.15

so X should also be lognormal distributed right?

My question is what is the mean value and standard deviation of parameter X?

Appreciate if someone can help me here :)

Thanks ]]>

I am trying to calculate cohen's d (standardised mean difference) for a study that only reports the range (min and max), and not the mean or standard deviation. I am wondering if it's possible to calculate cohen's d using the sample size and range? And if so, what formula will provide the best estimate of d?

Thanks so much,

Dee ]]>