Statistics control Quantile method

Description of Method

The distribution of all observations within one month timespan is represented by the quartiles Q1, Q2 and Q3. The station and month specific reference quartiles Q1', Q2' and Q3' is calculated from the climate database either by the previous ten years or from a regional reference station.

A neighbour station n is selected with a corresponding set of quartiles Q1n, Q2n and Q3n. The neighbour station also have the station and month specific reference quartiles Q1'n, Q2'n and Q3'n.

An error is detected when

|Q1 - Q1'| - |Q1n - Q1n'| > tol1 and |Q1 - Q1'| > tol2

or

|Q2 - Q2'| - |Q2n - Q2n'| > tol3 and |Q2 - Q2'| > tol4

or

|Q3 - Q3'| - |Q3n - Q3n'| > tol5 and |Q3 - Q3'| > tol6

where

tol1 - tol6 are six tolerance values.

Quality Control Level

QC2d-4

Run Parameters

It shall be possible to run the algorithm for

UU

NN

HL

VV

QO

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 neighbour station

Definition of regions and related region reference station

Extracts from KDVH