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| * **LANGUAGE** Language of the interview. This variable is included in multi-language surveys **or** if the option //Download variables which have not been used in the questionnaire// was selected. Should the interview language change during the interview, this is the language used at last. | * **LANGUAGE** Language of the interview. This variable is included in multi-language surveys **or** if the option //Download variables which have not been used in the questionnaire// was selected. Should the interview language change during the interview, this is the language used at last. | ||
| * **STARTED** Time when the participant started the interview. | * **STARTED** Time when the participant started the interview. | ||
| + | * **MAILSENT** In interviews, which were started by a personalized mailing URL, the time of sending the mail is stored here. But only if the address entry uses the [[:en:survey:mailing#data protection mode|data protection mode]] "personalized". Otherwise, it may be possible to use the function ''[[:en:create:functions:paneldata]]''. | ||
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| ===== Interview Progress ===== | ===== Interview Progress ===== | ||
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| * **MISSREL** Percentage of missing answers weighted by the other participants answering behavior. Questions that are rarely answered (e.g., voluntary text questions) are mostly irrelevant for this value, questions that most participants have answered weight worse. The linear weighting factor for a question/item is the number of answers given to this question/item divided by how often the question/item has been asked.\\ **Note:** This value may vary, depeding on the subset of data retreived. | * **MISSREL** Percentage of missing answers weighted by the other participants answering behavior. Questions that are rarely answered (e.g., voluntary text questions) are mostly irrelevant for this value, questions that most participants have answered weight worse. The linear weighting factor for a question/item is the number of answers given to this question/item divided by how often the question/item has been asked.\\ **Note:** This value may vary, depeding on the subset of data retreived. | ||
| * **DEG_TIME** Negative points for extremely fast completion. This value is normed in such way that values of more than 100 points indicate low-quality data. Data quality, however, is no dichotomous attribute. If you prefer a more strict filtering, a threshold of 75 or even 50 points may as well be useful as a threshold of 200 for more liberal filtering. Note, that //TIME_RSI// is a more elaborate indicator for fast responding. | * **DEG_TIME** Negative points for extremely fast completion. This value is normed in such way that values of more than 100 points indicate low-quality data. Data quality, however, is no dichotomous attribute. If you prefer a more strict filtering, a threshold of 75 or even 50 points may as well be useful as a threshold of 200 for more liberal filtering. Note, that //TIME_RSI// is a more elaborate indicator for fast responding. | ||
| - | * **TIME_RSI** This parameter is documented in more detail in the article [[https://www.researchgate.net/publication/258997762|Too Fast, too Straight, too Weird]] (as "relative speed index"). Records with a value greater than 1.6 should be considered more closely. From a value of 2.0 on, it is very unlikely that the participant has completed the questionnaire in a meaningful way. However, knowledge questions that the participant may have to investigate can distort the value (participants with good prior knowledge are faster). | + | * **TIME_RSI** This parameter is documented in detail in the article [[https://ojs.ub.uni-konstanz.de/srm/article/view/7403|Too Fast, too Straight, too Weird]] (named "relative speed index"). Records with a value in the range of 2.0 and above should be considered critically. However, knowledge questions that the participant may need to research may distort the value (participants with good prior knowledge are faster). |
| + | * **Q_VIEWER** In the questionnaire you can enable the option "Option to view the questionnaire without answering mandatory questions". When the function is active, this variable indicates whether a participant has checked the corresponding box ("I only want to view the questionnaire"). | ||
| Whether a questionnaire has been completed in its entirety can be determined using the variables //LASTPAGE// and //FINISHED// (see above). //MISSREL// is a valuable indicator of the participant's diligence and for data records that originate from "just looking at". The time invested for completion is not a direct indicator of data quality, but very short response times (//TIME_SUM// and //TIME_RSI//) indicate that the questions were not even read. | Whether a questionnaire has been completed in its entirety can be determined using the variables //LASTPAGE// and //FINISHED// (see above). //MISSREL// is a valuable indicator of the participant's diligence and for data records that originate from "just looking at". The time invested for completion is not a direct indicator of data quality, but very short response times (//TIME_SUM// and //TIME_RSI//) indicate that the questions were not even read. | ||
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