ELAN offers a possibility to compute some statistics of the tiers. Click on
View > Annotations Statistics and select a tier in the
dialog window:
Figure 5.88. Annotations Statistics
If you wish the Annotations tab to show the statistics of a
dependent tier, uncheck Show only root tiers
and select it. Uncheck the
next option if you want ELAN to count all contiguous annotations with the same value
as
1.
The observation period is the interval between the beginning of
the first annotation of all tiers and the end of the last annotation of all tiers.
If
you want ELAN to use the total media duration, just check Use media duration as
observation period
.
The Annotations tab shows the following information:
- Annotation
- Occurrences: the number of occurrences (contiguous annotations containing the
same value count as only one occurrence if the relevant option is checked).
- Frequency: the frequency defined as the number of occurrences divided by the
observation period.
- Average Duration: the average duration defined as the total duration of the
annotations with the same value divided by the number of occurrences.
- Time Ratio: the time ratio defined as the total duration of the annotations
containing the same value divided by the observation period.
- Latency: the latency defined as the time interval between the beginning of the
observation period and the first occurrence of an annotation.
The Annotations II tab shows:
- Annotation
- Occurrences: the number of occurrences.
- Minimal Duration: the duration of the shortest (in time) annotation.
- Maximal Duration: the duration of the longest (in time) annotation.
- Average Duration: the average duration defined as the total duration of the
annotations with the same value divided by the number of occurrences.
- Median Duration: the median duration defined as the duration that separates
the lower half of the annotation durations from the higher half.
- Annotation Duration Percentage: the ratio between the total duration of the
annotations and the total media duration expresses as a percentage.
- Latency: the latency defined as the time interval between the beginning of the
observation period and the first occurrence of an annotation.
In the Annotations II tab, contiguous annotations
with the same value are not counted as 1. The observation period is
the same as the media duration.
The Tiers tab shows:
Figure 5.89. Tiers statistics
- Tier: the name of a tier.
- Number of Annotations: the number of annotation on that tier.
- Minimal Duration: the minimal duration of an annotation on that tier.
- Maximal Duration: the maximal duration of an annotation on that tier.
- Average Duration: the average duration of the annotations on that tier.
- Median Duration: the median duration of the annotations on that tier.
- Total Annotation Duration: the total duration of all annotations on that
tier.
- Annotation Duration Percentage: the percentage of the total annotation
duration of the media duration.
- Latency: the time interval between the beginning of the observation period and
the first annotation on that tier.
The observation period on the
Tier tab is the interval between the begin and the end of the
media.
The statistics on the tabs Linguistic Type,
Participant, Annotator are similar to the
statistics on the Tiers tab except that they apply to linguistic
type, participant and annotator respectively.