Good morning all
I need assistance to calculate the minimum sample size for a piece of hospital-based research work. I have read through the Stata documentation for power and sample size (Release 15) and I still do not have a sense of direction about how to do so
The aim is to determine the appropriate time for the estimation of haemoglobin concentration after blood transfusion in children aged 1- 17 years.
With objectives to determine the time of equilibration of haemoglobin concentration after a blood transfusion and to determine the relationship between time of equilibration and recipients’ variables like age, sex, and body mass index and pre-transfusion Hb concentration and To determine the relationship between donor’s Hb concentration, duration of storage of blood and equilibration time.
I wish to know what level of change occurs in haemoglobin concentration between 1, 6, 12, and 24 hours after blood transfusion
I suppose this is a time series or panel data and I am needed to show how I will derive the minimum sample size
I couldn’t decide the aspect of power and sample size section (Stata 16) to use in Stata and or how to calculate it manually and will appreciate help
Thank you
Ezeanosike Obum
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