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Accuracy Indicators Accuracy Indicators

Definition and presentation of accuracy indicators

 

Type of data collection

Accuracy indicators

Definition and presentation

A: Census

Response rate

achieved number(1)/ frame population number

Presented as %

 

Coverage rate

total value of production of the respondent units/total value of production of the frame population

Presented as %

Coefficient of Variation (CV)

only if response rate <70% (2)

a.i. formula 
where:
ô(Ŷ) is the estimate standard deviation of Ŷ
Ŷ is the estimated total value per fleet segment of the variable e.g. total energy costs (3)

Presented as absolute value (0.2 rather than 20%)
 

B: Probability Sample survey

C: Non-Probability Sample survey

Achieved sampling rate

achieved sample number(4)/frame population number

Presented as %

Coverage rate

total value of production of the respondent units/total value of production of the frame population

Presented as %

Response rate

achieved sample number(4)/planned sample number(5)

Presented as %

Coefficient of Variation (CV)

a.i. formula
where:
ô(Ŷ) is the estimated standard deviation of Ŷ
Ŷ is the estimate of the total (3)

Presented as absolute value (0.2 rather than 20%)

 

(1) Achieved Number is the number of respondents who supplied data in response to the census

(2) CV is also required for census which achieves a low response rate (<70%) as this must be treated as if it were a Non-Probability Sample survey

(3) The estimated total is the final estimate for each variable and each fleet segment, according to appendix VI of DCF (e.g. estimated total energy costs, estimated total crew costs, per fleet segment).

(4) Achieved sample Number is the number of respondents that supply data (and not, for instance, the number of questionnaires sent out, or number of companies contacted)

(5) Planned sample Number is the number of units to be contacted for the survey (even though you may not expect all of them to respond and supply data)

 

reference: STECF report (11-19)