I want to present mean values (with SD/SE) of years of field data (agronomic, insect attack, protein expression, etc.) taken across 50 locations in three agro-climatic zone. What will me more accurate, mean of 4 year's mean (i.e. mean of 4 means), or mean of all 4 yrs of data combined? Sample size is the not the same across years..
Andrei P Kirilenko
Not sure if that's relevant at this point, but assuming the regions are similar in size I'd take mean of means; pooled mean would over-emphasize significance of the region where you have more samples. Say, you have 50 samples of GDD measurements from a warm temperate zone and 5 from cool temperate; pooled mean would render the latter one nearly irrelevant.
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