Prevalence, duration, and frequency modifiers

Criteria & assessment

prevalence percent record or epoch

continuous

>=90

abundant

50-89

frequent

10-49

occasional

1-9

rare

<1

denominator

proportion of the record or epoch that includes or is within the pattern; intervals between widely spaced PDs count as pattern duration

multiple patterns

Record each pattern and its own prevalence.

typical duration

very long

>=1 h

long

10-59 min

intermediate

1-9.9 min

brief

10-59 s

very brief

<10 s

also required

longest continuous duration

frequency hz

required

• typical
• minimum
• maximum

categories

• <0.5
• 0.5
• 1
• 1.5
• 2
• 2.5

very brief additional categories

• 3
• 3.5
• 4

PD SW restriction

Typical frequency >2.5 Hz is an RPP only when duration is <10 s; at >=10 s it is outside this RPP contract.