Table of Contents
QC2d-4 Statistics control Mean Value Method
Description of Method
The arithmetic mean value of 30 days observations M is calculated. Day d is the date 15 days prior to present. Daily station specific normal values is extracted from the climate database. The value M' is the normal value of day d.
Corresponding values at three neighbour stations are Mn1, Mn2, Mn3. Corresponding reference normal value at three neighbour stations are Mn'1, Mn'2, Mn'3.
An error is detected when
| M - M' | > tol1
and at least two of the three following inequalities are satisfied
| Mn1 - Mn'1 | < tol1
| Mn2 - Mn'2 | < tol1
| Mn3 - Mn'3 | < tol1
where tol1 is a tolerance value
Quality Control Level
- QC2d-4
Run Parameters
It shall be possible to run the algorithm for
- TA
- PR
Characteristics of the data to which the method is applied
CONTROLINFO AND/OR USEINFO
- none
TYPEID, OTHER METADATA
- all typeid
Flag Settings
SPECIFICATION OF CONTROLFLAGS TO BE SET FOR EXPECTED RESULTS OF THE ALGORITHM, I.E. CONSIDER BOTH POSITIVE AND NEGATIVE RESULTS
- fstat=1 on no error detection
- fstat=2 on error detection
EXPECTIONS OF THE USEINFO FLAGS CORRESPONDING TO CONTROLINFO FLAG SETTINGS
- fstat=2 → useinfo(2)=2
Dependencies
- Definition of neighbor stations
- Definition of regional reference stations when normal values is unavailable
- Extracts from KDVH