Nuclear Data Section
International Atomic Energy Agency
P.O.Box 100, A-1400 Vienna, Austria
Memo CP-D/522

Date:
To:
From:

18 September 2008
Distribution
N.Otsuka, S.Dunaeva

Subject:

Usage of data headings and explanation under ERR-ANALYS

1. Usage of data headings for uncertainty independent variable
The current coding rules for major data headings for uncertainties are summarized
below (See LEXFOR “Errors” for more details):
Heading
ERR-T
ERR-S
ERR-SYS
ERR-1,
ERR-2,…
MONIT-ERR
DATA-ERR

DATA-ERR1,
DATA-ERR2,…
ERR-DIG
EN-DIG…

Usage
Total uncertainty which components are also given under ERRS, ERR-SYS, ERR-n, MONIT-ERR etc.
Statistical uncertainty
Total systematic uncertainty (partial systematic uncertainties areknown or unknown)
Partial systematic uncertainty except uncertainty in monitor
reaction cross section.
Uncertainty in monitor reaction cross section
1. Uncertainty which property (statistical or systematic) is
uncertain for the compiler
2. Total uncertainty which components are not given under
ERR-S, ERR-SYS, ERR-n, MONIT-ERR etc.
Similar to DATA-ERR, but more than two components ofuncertainties are given by authors.
Uncertainty due to digitization.

If the uncertainty depends on independent variables, and the minimum and/ormaximum of the uncertainty are given, they may not be coded under data headings in
the COMMON section. They should be explained under ERR-ANALYS in free text.

2. Definition of uncertainty under ERR-ANALYS
The EXFOR format manual “ERR-ANALYS” explains that“Presence is obligatory, except when not relevant. May contain free text or coded
information with free text. However, coded information is obligatory when morethan one error field is given in the data set.”In real compilation, however, we often omit this coded information for uncertainties
in independent variable. We would propose that the coded information is optional for
uncertainties in independent variables.
“Presence is obligatory, except when not relevant. May contain free text or coded
information with free text. However, coded information is obligatory when morethan one error field is given in the data set except uncertainties in independentvariables.”Example 1 (some partial errors are known)…
ERR-ANALYS (ERR-T) Total uncertainty- Detector efficiency- Statistical uncertainty(ERR-1) - Standard cross section(ERR-2) – Irradiation geometry...
COMMON
23
ERR-1
ERR-2
PER-CENT
PER-CENT
6.0
2.5
ENDCOMMON
30
DATA
36EN
DATA
ERR-T
MEV
MB
MB
13.50
1951.
85.
13.84
1907.
90.

(0.5%-1.5%)(<3.0%)(6.0%)(2.5%)

X000100100019
X000100100020
X000100100021
X000100100022
X000100100023
X000100100036
X000100100037
X000100100038
X000100100039
X000100100040
X000100100009
X000100100010
X000100100011
X000100100012
X000100100013...
Example 2 (partial errors are unknown)…
ERR-ANALYS (DATA-ERR) Total uncertainty (no detail is given)…
NOCOMMON00
ENDCOMMON
DATA
EN
MEV
13.50
13.84
…

DATA
MB
1951.
1907.

3
3
DATA-ERR
MB
85.
90.

0
6

X000200100019
X000200100036
X000200100040
X000200100009
X000200100010
X000200100011
X000200100012
X000200100013

Example 3 (Digitized data points without error bars)…
ERR-ANALYS Absolute uncertainty is less than 30%.
STATUS(CURVE) Digitized from Fig.3
COMMON
13
ERR-DIG
PER-CENT
6.0
ENDCOMMON30DATA
36EN
DATA
MEV
MB
13.50
1951.
13.84
1907.
…

X000300100019
X000100100036
X000100100037
X000100100038
X000100100039
X000100100040
X000300100009
X000300100010
X000300100011
X000300100012
X000300100013

Distribution:
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a.nichols@iaea.org
blokhin@ippe.ru
chiba@earth.sgu.ac.jp
claes.nordborg@oecd.org
ganesan@barc.gov.in
gezg@ciae.ac.cn
hasegawa@nea.fr
henriksson@near.fr
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jhchang@kaeri.re.kr
kaltchenko@kinr.kiev.ua
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manokhin@ippe.ru
mmarina@ippe.ru
mwherman@bnl.gov

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