6. Accuracy and reliability |
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6.1. Accuracy - overall |
6.1.1 How good is the accuracy? |
Good |
6.1.2 What are the main factors lowering the accuracy? |
Sampling error |
6.1.3 If Other, please specify |
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6.1.4 Additional comments |
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6.2. Sampling error |
Sample survey
These questions only apply to surveys. If there is more than one survey, please describe the main survey below and the additional ones in table 6.2 of the annexed Excel file |
6.2.1 Name/Title |
Survey on plantations of fruit trees, olives and table grapes |
6.2.2 Methods used to assess the sampling error |
Relative standard error |
6.2.3 If Other, please specify |
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6.2.4 Methods used to derive the extrapolation factor |
Basic weight |
6.2.5 If Other, please specify |
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6.2.6 If coefficients of variation are calculated, please describe the calculation methods and formulas |
The variance was calculated using the boot strap estimator, i.e. drawing a series of independent samples from sampled observations, using the same sample cdesign as the one by which the initial sample was drawn from the population |
6.2.7 Sampling error - indicators |
Please provide the coefficients of variation in %
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CV (%) |
Dessert apple trees |
1,9 |
Apple trees for industrial processing |
1,4 |
Dessert pear trees |
1,5 |
Pear trees for industrial processing |
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Apricot trees |
1,4 |
Dessert peach and nectarine trees |
1,5 |
Peach and nectarine trees for industrial processing (including group of Pavie) |
1,6 |
Orange trees |
1,2 |
Small citrus fruit trees |
1,1 |
Lemon trees |
1,3 |
Olive trees |
1,3 |
Table grape vines |
1,3 |
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6.2.8 Additional comments |
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6.3. Non-sampling error |
See sections below. |
6.3.1. Coverage error |
Census
These questions only apply to censuses. If there is more than one census, please describe the main census below and the additional ones in table 6.3 of the annexed Excel file |
6.3.1.1 Name/Title |
Encuesta sobre plantaciones de árboles frutales, olivar y uva de mesa. / Survey on plantations of fruit trees, olives and table grapes |
Over-coverage
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6.3.1.2 Does the sample frame include wrongly classified units that are out of scope? |
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6.3.1.3 What methods are used to detect the out-of scope units? |
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6.3.1.4 Does the sample frame include units that do not exist in practice? |
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6.3.1.5 Over-coverage - rate |
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6.3.1.6 Impact on the data quality |
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Under-coverage
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6.3.1.7 Does the sample frame include all units falling within the scope of this survey? |
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6.3.1.8 If Not, which units are not included? |
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6.3.1.9 How large do you estimate the proportion of those units? (%) |
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6.3.1.10 Impact on the data quality |
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Misclassification
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6.3.1.11 Impact on the data quality |
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Common units
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6.3.1.12 Common units - proportion |
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6.3.1.13 Additional comments |
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Sample survey
These questions only apply to surveys. If there is more than one survey, please describe the main survey below and the additional ones in table 6.3 of the annexed Excel file |
6.3.1.14 Name/Title |
Encuesta sobre plantaciones de árboles frutales, olivar y uva de mesa. / Survey on plantations of fruit trees, olives and table grapes |
Over-coverage
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6.3.1.15 Does the sample frame include wrongly classified units that are out of scope? |
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6.3.1.16 What methods are used to detect the out-of scope units? |
The nature of the survey (area frame survey) prevents out of scope units. |
6.3.1.17 Does the sample frame include units that do not exist in practice? |
No |
6.3.1.18 Over-coverage - rate |
Not applicable |
6.3.1.19 Impact on the data quality |
None |
Under-coverage |
6.3.1.20 Does the sample frame include all units falling within the scope of this survey? |
Yes |
6.3.1.21 If Not, which units are not included? |
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6.3.1.22 How large do you estimate the proportion of those units? (%) |
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6.3.1.23 Impact on the data quality |
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Misclassification
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6.3.1.24 Impact on the data quality |
None |
Common units |
6.3.1.25 Common units - proportion |
Not applicable |
6.3.1.26 Additional comments |
Not Applicable |
Administrative data
These questions only apply to administrative sources. If there is more than one administrative source, please describe the main source below and the additional ones in table 6.3 of the annexed Excel file |
6.3.1.27 Name/Title of the administrative source |
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Over-coverage
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6.3.1.28 Does the administrative source include wrongly classified units that are out of scope? |
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6.3.1.29 What methods are used to detect the out-of scope units? |
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6.3.1.30 Does the administrative source include units that do not exist in practice? |
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6.3.1.31 Over-coverage - rate |
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6.3.1.32 Impact on the data quality |
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Under-coverage
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6.3.1.33 Does the administrative source include all units falling within the scope of this survey? |
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6.3.1.34 If Not, which units are not included? |
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6.3.1.35 How large do you estimate the proportion of those units? (%) |
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6.3.1.36 Impact on the data quality |
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Misclassification |
6.3.1.37 Impact on the data quality |
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6.3.1.38 Additional comments |
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6.3.2. Measurement error |
Census
These questions only apply to censuses. If there is more than one census, please describe the main census below and the additional ones in table 6.3 of the annexed Excel file |
6.3.2.1 Name/Title |
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6.3.2.2 Is the questionnaire based on usual concepts for respondents? |
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6.3.2.3 Number of censuses already performed with the current questionnaire? |
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6.3.2.4 Preparatory testing of the questionnaire? |
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6.3.2.5 Number of units participating in the tests? |
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6.3.2.6 Explanatory notes/handbook for surveyors/respondents? |
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6.3.2.7 On-line FAQ or Hot-line support for surveyors/respondents? |
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6.3.2.8 Are there pre-filled questions? |
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6.3.2.9 Percentage of pre-filled questions out of total number of questions |
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6.3.2.10 Other actions taken for reducing the measurement error? |
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6.3.2.11 Additional comments |
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Sample survey
These questions only apply to surveys. If there is more than one survey, please describe the main survey below and the additional ones in table 6.3 of the annexed Excel file |
6.3.2.12 Name/Title |
Survey on plantations of fruit trees, olives and table grapes |
6.3.2.13 Is the questionnaire based on usual concepts for respondents? |
Yes |
6.3.2.14 Number of surveys already performed with the current questionnaire? |
4 |
6.3.2.15 Preparatory testing of the questionnaire? |
Yes |
6.3.2.16 Number of units participating in the tests? |
100 |
6.3.2.17 Explanatory notes/handbook for surveyors/respondents? |
Yes |
6.3.2.18 On-line FAQ or Hot-line support for surveyors/respondents? |
Yes |
6.3.2.19 Are there pre-filled questions? |
Yes |
6.3.2.20 Percentage of pre-filled questions out of total number of questions |
90% |
6.3.2.21 Other actions taken for reducing the measurement error? |
No |
6.3.2.22 Additional comments |
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6.3.3. Non response error |
Census
These questions only apply to censuses. If there is more than one census, please describe the main census below and the additional ones in table 6.3 of the annexed Excel file |
6.3.3.1 Name/Title of the survey |
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6.3.3.2 Unit non-response - rate |
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6.3.3.3 How do you evaluate the recorded unit non-response rate in the overall context? |
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6.3.3.4 Measures taken for minimising the unit non-response |
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6.3.3.5 If Other, please specify |
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6.3.3.6 Item non-response rate |
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6.3.3.7 Item non-response rate - Minimum |
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6.3.3.8 Item non-response rate - Maximum |
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6.3.3.9 Which items had a high item non-response rate? |
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6.3.3.10 Additional comments |
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Sample survey
These questions only apply to surveys. If there is more than one survey, please describe the main survey below and the additional ones in table 6.3 of the annexed Excel file |
6.3.3.11 Name/Title of the survey |
Survey on plantations of fruit trees, olives and table grapes |
6.3.3.12 Unit non-response - rate |
1.25% |
6.3.3.13 How do you evaluate the recorded unit non-response rate in the overall context? |
Low |
6.3.3.14 Measures taken for minimising the unit non-response |
Follow-up interviews |
6.3.3.15 If Other, please specify |
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6.3.3.16 Item non-response rate |
4.23% |
6.3.3.17 Item non-response rate - Minimum |
1.43% / Variety |
6.3.3.18 Item non-response rate - Maximum |
2.01% / Density |
6.3.3.19 Which items had a high item non-response rate? |
Orchards Age 1.87% Density of Plantation 2.01% Variety 1.43% |
6.3.3.20 Additional comments |
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6.3.4. Processing error |
Census
These questions only apply to censuses. If there is more than one census, please describe the main census below and the additional ones in table 6.3 of the annexed Excel file |
6.3.4.1 Name/Title |
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6.3.4.2 Imputation - rate |
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6.3.4.3 Imputation - basis |
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6.3.4.4 If Other, please specify |
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6.3.4.5 Additional comments |
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Sample survey
These questions only apply to surveys. If there is more than one survey, please describe the main survey below and the additional ones in table 6.3 of the annexed Excel file |
6.3.4.6 Name/Title |
Encuesta sobre plantaciones de árboles frutales, olivar y uva de mesa. / Survey on plantations of fruit trees, olives and table grapes |
6.3.4.7 Imputation - rate |
6,9% of the land cover in agricultural areas, 77,6% of the land cover in non-agricultural areas |
6.3.4.8 Imputation - basis |
Same unit in previous data |
6.3.4.9 If Other, please specify |
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6.3.4.10 How do you evaluate the impact of imputation on Coefficients of Variation? |
Not important |
6.3.4.11 Additionnal comments |
Imputation is made mainly in lower crop index strata. |
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6.3.5. Model assumption error |
Not Applicable |
6.4. Seasonal adjustment |
Not Applicable |
6.5. Data revision - policy |
Corrections are made when wrong field information on previous surveys are found. |
6.6. Data revision - practice |
6.6.1 Data revision - average size |
No data revisions have been done |
6.6.2 Were data revisions due to conceptual changes (e.g. new definitions) carried out since the last quality report? |
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6.6.3 What was the main reason for the revisions? |
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6.6.4 How do you evaluate the impact of the revisions? |
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6.6.5 Additional comments |
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