How to use several SD coming from N studies, if SD follows Non Normal distribution and the mean of that variable follows Normal distribution?

I have recorded N, Mean, SD of a variable (X) from N studies. The size of ni varies from 4 to 784. The mean ranges from 22 to 175 and SD ranges from 0.7 to 134.9. With stratification over ni. I...

13 December 2017 8,454 2 View