Keyword Analysis & Research: what does frequency refer to

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does frequency refer to	0.26	1	3376	100	28
what	0.37	0.2	8799	66	4
does	0.5	0.4	9204	42	4
frequency	0.95	0.7	7172	97	9
refer	1.13	0.5	5040	64	5
to	1.1	0.8	1756	76	2

Keyword	CPC	PCC	Volume	Score
what does frequency refer to	0.35	0.7	4824	85