multi domain product review dataset in Turkish
Erkin Demirtas

since vast majority of votes converging to 5 stars, we regard mediocre class with rating 3 also as a negative mark

rating							1 		2		3		4		5		neg.avg		pos.avg
dvd (700pos + 700neg)			142		254		304		350		350		2.23		4.5
books (700pos + 700neg)			127		360		213		350		350		2.12		4.5
electronics (700pos + 700neg)	122		331		247		350		350		2.18		4.5
kitchen (700pos + 700neg)		96		126		478		350		350		2.55		4.5
total (2800pos + 2800neg)		487		1071	1242	1400	1400	2.27		4.5


multi domain product review dataset in English (http://www.cs.jhu.edu/~mdredze/datasets/sentiment/)
John Blitzer

rating							1 		2		3		4		5		neg.avg		pos.avg
dvd (1000pos + 1000neg)			530		470		0		286		714		1.47		4.714
books (1000pos + 1000neg)		538		462		0		269		731		1.462		4.731
electronics (1000pos + 1000neg)	666		334		0		320		680		1.334		4.68
kitchen (1000pos + 1000neg)		687		313		0		246		754		1.313		4.754
total (4000pos + 4000neg)		2421	1579	0		1121	2879	1.395		4.72