MIT Press

The tags are summarized in Table 1. Each tag consists of a veridicality value (certain [CT], probable [PR], possible [PS], underspecified [U]) and a polarity value (positive [+], negative [−], unknown [u]). CT+ corresponds to the standard notion of veridicality, CT − to anti-veridicality, and Uu to non-veridicality. The PR and PS categories add a modal or probabilistic element to the scale, to capture finer-grained intuitions.

Table 1.

FactBank annotation scheme. CT = certain; PR = probable; PS = possible; U = underspecified; + = positive; − = negative; u = unknown.

Value	Definition	Count
CT+	According to the source, it is certainly the case that X	7,749 (57.6%)
PR+	According to the source, it is probably the case that X	363 (2.7%)
PS+	According to the source, it is possibly the case that X	226 (1.7%)
CT−	According to the source, it is certainly not the case that X	433 (3.2%)
PR−	According to the source it is probably not the case that X	56 (0.4%)
PS−	According to the source it is possibly not the case that X	14 (0.1%)
CTu	The source knows whether it is the case that X or that not X	12 (0.1%)
Uu	The source does not know what the factual status of the event is, or does not commit to it	4,607 (34.2%)
		13,460

Value	Definition	Count
CT+	According to the source, it is certainly the case that X	7,749 (57.6%)
PR+	According to the source, it is probably the case that X	363 (2.7%)
PS+	According to the source, it is possibly the case that X	226 (1.7%)
CT−	According to the source, it is certainly not the case that X	433 (3.2%)
PR−	According to the source it is probably not the case that X	56 (0.4%)
PS−	According to the source it is possibly not the case that X	14 (0.1%)
CTu	The source knows whether it is the case that X or that not X	12 (0.1%)
Uu	The source does not know what the factual status of the event is, or does not commit to it	4,607 (34.2%)
		13,460

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