hello, many thanks for your answer. The whole context is as follows.
I´m doing a meta-analysis and intend to run a meta-regression. A meta-analysis synthesizes the results of previous research.
For this, I must use means and standard errors for all the analyzed variables. Although most of the studies disclose mean and SE, one of them does not do that. It provides just n, mean, median, Q5 and Q6 instead. Thus, a conversion (or some estimation) is needed here.
For instance:
Stocking density (kg/m2 ):
n = 87 cases
mean = 31.1
median (Q50) = 30.7
Q5 = 17.7
Q95 = 48.1
Where: Q = quantile (percent)
So the question is: What is the Standard Error? How do I calculate it with the provided information ?
I hope this is clearer now. thanks in advance. Germano