# A researcher needs to test differences in the expression of a gene 
# between different organs, e.g., brain, liver, kidney. 
# Ten female fish were used, and gene expression is measured for 
# different organs in each fish
# Fixed effect: difference among the three organs
# Random effect: difference among fish.
Fish	Tissue	Expr
1	Brain	33
1	Liver	10
1	Kidney	50
2	Brain	39
2	Liver	10
2	Kidney	51
3	Brain	40
3	Liver	10
3	Kidney	54
4	Brain	35
4	Liver	12
4	Kidney	51
5	Brain	38
5	Liver	14
5	Kidney	51
6	Brain	33
6	Liver	10
6	Kidney	53
7	Brain	37
7	Liver	12
7	Kidney	52
8	Brain	41
8	Liver	13
8	Kidney	54
9	Brain	37
9	Liver	10
9	Kidney	55
10	Brain	40
10	Liver	14
10	Kidney	51