Table 3.

Variance estimates partitioned by source, for the response: total alkaloid concentration in ponderosa pine foliage from seedlings grown in a common garden

Source of variation	d.f.	Expected mean square	Variance component	Percentage of total variation
Bed	3	σe2 + 1·99σw2 + 0·01σp/r2 + 0·01σr2 + 125·25σb2	σb2, 1638	1·7
Region	6	σe2 + 1·99σw2 + 7·95σp/r2 + 71·57σr2	σr2, 31 629	33·6
Family(region)	56	σe2 + 1·99σw2 + 7·95σp/r2	σp/r2, 6903	7·3
Row-plot[family(region)]	186	σe2 + 1·99σw2	σw2, 10 464	11·1
Residual error	249	σe2	σe2, 43 421	46·2