derivation set

derivation set

A group of patients with a clinical finding of interest (e.g., chest pain), which is studied retrospectively to identify facets of their disease that might help predict the intensity of observation (e.g., admission to ICU), appropriate diagnostic work-up (lab tests, imaging), and need for therapy.

derivation set

Decision-making A group of Pts with a clinical finding of interest–eg, chest pain, studied retrospectively, to identify facets of their disease that might help predict the intensity of observation–eg admission to ICU, appropriate diagnostic workup–lab tests, imaging, and need for therapy. See Validation set. Cf Cohort.
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However, accepting a threshold of 3 ng/L (above the LOD) in combination with the ECG would yield an NPV of 100% in their derivation set (n = 1040), 100% in their first validation set (n = 1818), and 99.
In 2009, after the JIFs including articles published in 2005 were released, each article in the dataset was allocated using random number generation (60:40 split) into a derivation set (760 articles in 99 journals) or a validation set (507 articles in 88 journals).
A multiple linear regression was performed on journal-level means from the derivation set and applied to the validation set using STATA Intercooled 9.
The mean predicted JIF in the derivation set was 4.
The distribution of variables in the validation and derivation set were comparable, except for the prevalence of malignancy (3% and 6%, respectively) and DVT (18% and 22%, respectively).
Their definition of a derivation set and our lineage definition are related, in the sense that both definitions attempt to isolate the base tuples that affect specific view tuples.
1997] the derivation set t [element of] V is defined as <[R'.
We introduce the concepts of derivation set and derivation pool in Definitions 8.
Given a tuple t [element of] V, the set of all of t's derivations according to v is called the derivation set of t according to v, denoted [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII](t).
Notice that a view tuple's derivation set and derivation pool contain exactly the same collection of base tuples, but organized in different ways.
No validation set is available for this index; the derivation set was 238 consecutive AAA patients enrolled from 1977 to 1988 from 1 institution in the Netherlands.
Validation set performed poorly for abdominal aortic aneurysm surgery; authors speculated low number of patients (~100) in derivation set responsible.