How close were opinion polls to the reality?

Difference between results and last opinion polls
published before election. Only data of the first seven parties were
taken into account in this comparison. 

Polls were made by three organizations:

SU SR (Statistics Institute)
FOCUS-CSA (Focus - Center for Social and Marketing Analysis)
MVK SRo (Cabinet of Methodics and Research of the Slovak Radio)

Span (difference between the most overestimated and the most underestimated
     entry):

1. SU SR: 	11.59 % (-7.56 - +4.39)
2. MVK SRo:	15.65 % (-13.46 - +2.19)
3. FOCUS:	18.35 % (-10.56 - +7.79)


Average difference:

1. SU SR:	+- 1.12 %
2. FOCUS:	+- 1.56 %
3. MVK SRo:	+- 1.63 %


Error per party:

Party	Average diff	Best	Worst
HZDS	-10.5		SU SR	MVK SRo
SV	+4.79		MVK SRo	FOCUS
(results of other parties show no significant difference)