Keyword Analysis & Research: what does that mean if acf is sinusoidal

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does that mean if acf is sinusoidal	1.37	0.3	4382	46	40
what	0.06	0.7	3705	100	4
does	1.3	0.6	9778	51	4
that	1.67	0.8	858	64	4
mean	1.61	0.1	1987	95	4
if	0.65	0.1	2561	27	2
acf	1.06	0.4	8092	80	3
is	0.05	0.8	7608	67	2
sinusoidal	1.66	0.3	2217	84	10

Keyword	CPC	PCC	Volume	Score
what does that mean if acf is sinusoidal	0.48	0.8	9577	21