Keyword Analysis & Research: what is the idf in text mining

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what is the idf in text mining	0.21	0.9	3038	30	30
what	1.45	0.7	3268	90	4
is	1.87	0.5	2886	36	2
the	0.07	0.2	9986	41	3
idf	1.59	0.2	2816	95	3
in	1.3	0.5	6203	81	2
text	0.01	1	9728	40	4
mining	1.73	0.1	5185	15	6

Keyword	CPC	PCC	Volume	Score
what is the idf in text mining	1.08	0.4	8830	71