the field $avg must be an accumulator object

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
the field $avg must be an accumulator object	1.27	0.3	8357	46	44
the	1.62	0.8	6131	66	3
field	1.74	0.1	862	21	5
$avg	0.31	0.8	8302	66	4
must	0.91	0.1	1663	29	4
be	1.01	0.4	4763	77	2
an	1.23	0.3	5351	70	2
accumulator	1.43	1	1912	64	11
object	0.08	0.9	379	27	6

Keyword	CPC	PCC	Volume	Score
the field $avg must be an accumulator object	0.11	0.7	9538	92
the field must be an accumulator object	1.35	0.3	4071	31
must be an accumulator object	1.88	0.4	2111	26
the $add accumulator is a unary operator	0.8	0.2	6987	54
an integer for the accumulator	1.87	0.2	7800	96
which of these is the accumulator variable	1.11	0.6	2619	19
initial_accumulator_value	0.15	1	5395	53
accumulator_set	0.77	0.9	5611	7
accumulator takes no arguments	1.7	0.7	8203	27
mongodb field must be an accumulator object	0.02	1	6291	31
the field count must be an accumulator object	1.28	0.7	3185	27
the field name must be an accumulator object	0.99	0.1	980	76
name accumulator is not defined	0.29	1	387	95
accumulator function computer science	0.12	0.7	3409	53