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

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

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