6. Accuracy and reliability |
Top |
|
|
6.1. Accuracy - overall |
6.1.1 How good is the accuracy? |
Very good |
6.1.2 What are the main factors lowering the accuracy? |
Coverage error Measurement error Non-response error Sampling error |
6.1.3 If Other, please specify |
|
6.1.4 Additional comments |
|
|
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 FRUIT AND OLIVE PLANTATIONS |
6.2.2 Methods used to assess the sampling error |
Relative standard error |
6.2.3 If Other, please specify |
|
6.2.4 Methods used to derive the extrapolation factor |
Basic weight |
6.2.5 If Other, please specify |
|
6.2.6 If coefficients of variation are calculated, please describe the calculation methods and formulas |
The standard error for each variable is estimated by: Se = √ΣHi=1 Nhi (Whi - 1) S2i where:
- Nhi is the total number of holdings in stratum i
- Whi is the weight of each holding in stratum i and
- S2i is the variance within stratum i
|
6.2.7 Sampling error - indicators |
Please provide the coefficients of variation in %
|
CV (%) |
Dessert apple trees |
1.5% |
Apple trees for industrial processing |
|
Dessert pear trees |
1.9% |
Pear trees for industrial processing |
|
Apricot trees |
1.8% |
Dessert peach and nectarine trees |
2% |
Peach and nectarine trees for industrial processing (including group of Pavie) |
|
Orange trees |
2.7% |
Small citrus fruit trees |
0.9% |
Lemon trees |
1.2% |
Olive trees |
0.6% |
Table grape vines |
|
|
6.2.8 Additional comments |
|
|
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 |
|
Over-coverage
|
6.3.1.2 Does the sample frame include wrongly classified units that are out of scope? |
|
6.3.1.3 What methods are used to detect the out-of scope units? |
|
6.3.1.4 Does the sample frame include units that do not exist in practice? |
|
6.3.1.5 Over-coverage - rate |
|
6.3.1.6 Impact on the data quality |
|
Under-coverage
|
6.3.1.7 Does the sample frame include all units falling within the scope of this survey? |
|
6.3.1.8 If Not, which units are not included? |
|
6.3.1.9 How large do you estimate the proportion of those units? (%) |
|
6.3.1.10 Impact on the data quality |
|
Misclassification
|
6.3.1.11 Impact on the data quality |
|
Common units
|
6.3.1.12 Common units - proportion |
|
6.3.1.13 Additional comments |
|
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 |
SURVEY ON FRUIT AND OLIVE PLANTATIONS |
Over-coverage
|
6.3.1.15 Does the sample frame include wrongly classified units that are out of scope? |
Yes |
6.3.1.16 What methods are used to detect the out-of scope units? |
Coverage was limited to interviewing the holders who appeared in the sample. This implies that there could be no over-coverage. However, 618 cases no longer belonged to the target population leading to an over-coverage rate of 2.3%. These 618 units were holdings with ceased activities because of two main reasons. First reason is that they changed the use of the holding in the sense that the land was no longer agricultural but became land plots for building and last the agricultural activities were abandoned. These cases led to an insignificant over-coverage error. However, the cases were subtracted from the frame and the weights were recalculated. |
6.3.1.17 Does the sample frame include units that do not exist in practice? |
No |
6.3.1.18 Over-coverage - rate |
2.3% |
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? |
No |
6.3.1.21 If Not, which units are not included? |
The large volume of information that was provided from the farm register assisted in minimizing the number of cases lost. From the initial sample taken from the register, 71 cases were not possible to be included because they were new units, because of real birth or demergers. |
6.3.1.22 How large do you estimate the proportion of those units? (%) |
This leads to a statistically insignificant under-coverage rate of 0.3%. |
6.3.1.23 Impact on the data quality |
None |
Misclassification
|
6.3.1.24 Impact on the data quality |
None |
Common units |
6.3.1.25 Common units - proportion |
|
6.3.1.26 Additional comments |
|
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 |
|
Over-coverage
|
6.3.1.28 Does the administrative source include wrongly classified units that are out of scope? |
|
6.3.1.29 What methods are used to detect the out-of scope units? |
|
6.3.1.30 Does the administrative source include units that do not exist in practice? |
|
6.3.1.31 Over-coverage - rate |
|
6.3.1.32 Impact on the data quality |
|
Under-coverage
|
6.3.1.33 Does the administrative source include all units falling within the scope of this survey? |
|
6.3.1.34 If Not, which units are not included? |
|
6.3.1.35 How large do you estimate the proportion of those units? (%) |
|
6.3.1.36 Impact on the data quality |
|
Misclassification |
6.3.1.37 Impact on the data quality |
|
6.3.1.38 Additional comments |
|
|
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 |
|
6.3.2.2 Is the questionnaire based on usual concepts for respondents? |
|
6.3.2.3 Number of censuses already performed with the current questionnaire? |
|
6.3.2.4 Preparatory testing of the questionnaire? |
|
6.3.2.5 Number of units participating in the tests? |
|
6.3.2.6 Explanatory notes/handbook for surveyors/respondents? |
|
6.3.2.7 On-line FAQ or Hot-line support for surveyors/respondents? |
|
6.3.2.8 Are there pre-filled questions? |
|
6.3.2.9 Percentage of pre-filled questions out of total number of questions |
|
6.3.2.10 Other actions taken for reducing the measurement error? |
|
6.3.2.11 Additional comments |
|
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 FRUIT AND OLIVE PLANTATIONS |
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? |
2 |
6.3.2.15 Preparatory testing of the questionnaire? |
No |
6.3.2.16 Number of units participating in the tests? |
|
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? |
No |
6.3.2.19 Are there pre-filled questions? |
No |
6.3.2.20 Percentage of pre-filled questions out of total number of questions |
|
6.3.2.21 Other actions taken for reducing the measurement error? |
When cases of measurement errors were found, they were corrected at the very moment they were found, therefore by the end of the survey the measurement errors in the data were minimized. Errors were checked by checking the data against the prior information available in the existing register and in many cases by contacting the holder again through the telephone. Follow-up interviews were carried out during the data collection process in those cases where the checking process suggested that these should be done. |
6.3.2.22 Additional comments |
|
|
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 |
|
6.3.3.2 Unit non-response - rate |
|
6.3.3.3 How do you evaluate the recorded unit non-response rate in the overall context? |
|
6.3.3.4 Measures taken for minimising the unit non-response |
|
6.3.3.5 If Other, please specify |
|
6.3.3.6 Item non-response rate |
|
6.3.3.7 Item non-response rate - Minimum |
|
6.3.3.8 Item non-response rate - Maximum |
|
6.3.3.9 Which items had a high item non-response rate? |
|
6.3.3.10 Additional comments |
|
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 FRUIT AND OLIVE PLANTATIONS |
6.3.3.12 Unit non-response - rate |
1.5% |
6.3.3.13 How do you evaluate the recorded unit non-response rate in the overall context? |
Very low |
6.3.3.14 Measures taken for minimising the unit non-response |
Follow-up interviews Reminders Weighting |
6.3.3.15 If Other, please specify |
|
6.3.3.16 Item non-response rate |
|
6.3.3.17 Item non-response rate - Minimum |
Not applicable |
6.3.3.18 Item non-response rate - Maximum |
Not applicable |
6.3.3.19 Which items had a high item non-response rate? |
|
6.3.3.20 Additional comments |
Non-response is measured as the agricultural holdings that did not provide any information (i.e. the holder was too busy or refused to give information, the holder was unable to give information because of illness or the holder was abroad during the survey period). Hence, non response does not apply to items included in the survey, but to the whole questionnaire. |
|
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 |
|
6.3.4.2 Imputation - rate |
|
6.3.4.3 Imputation - basis |
|
6.3.4.4 If Other, please specify |
|
6.3.4.5 Additional comments |
|
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 |
SURVEY ON FRUIT AND OLIVE PLANTATIONS |
6.3.4.7 Imputation - rate |
Not available |
6.3.4.8 Imputation - basis |
Same unit in previous data Other sources |
6.3.4.9 If Other, please specify |
|
6.3.4.10 How do you evaluate the impact of imputation on Coefficients of Variation? |
|
6.3.4.11 Additionnal comments |
|
|
6.3.5. Model assumption error |
|
6.4. Seasonal adjustment |
|
6.5. Data revision - policy |
A data revision policy is in place at CYSTAT. It is published on CYSTAT’s website, at the following link: http://www.mof.gov.cy/mof/cystat/statistics.nsf/dissemination_en/dissemination_en?OpenDocument CYSTAT also publishes a list of scheduled revisions (regular or major revisions), also published on its website. In the case of the SURVEY ON FRUITS AND OLIVE PLANTATIONS, no revisions are made. Annexes: Revision Policy of CYSTAT |
6.6. Data revision - practice |
6.6.1 Data revision - average size |
No revisions were made |
6.6.2 Were data revisions due to conceptual changes (e.g. new definitions) carried out since the last quality report? |
|
6.6.3 What was the main reason for the revisions? |
|
6.6.4 How do you evaluate the impact of the revisions? |
|
6.6.5 Additional comments |
|
|