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Data entry statistics

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Snap Desktop calculates statistics about the speed of data entry and whether there were errors.

If the data is entered by hand, the statistics can help you cost the data entry by calculating the cost per case or per hour. The layout or clarity of the questionnaire can affect these figures. The summary also shows whether cases have been deleted or whether there are errors in the entries.

  1. Click Data Entry  DataEntryIcon.png on the Snap Desktop toolbar to display the Data Entry window for the selected survey.
  2. Click Statistics  StatisticsIcon.png  on the Data Entry toolbar to display the Data Entry Statistics window. The statistics available vary depending on the type of survey and data entry method. If you have scanning enabled, this displays a scanning summary.
Scan : Data entry statistics dialog for scanning

Statistic

Meaning

Total number of cases

Total raw data cases stored for all editions of the current survey

Number of deleted cases

Number of cases deleted across all editions of the current survey

Number of verified cases

Number verified across all editions. Note that verified cases become unverified if they are subsequently changed so this value can increase and decrease over time.

Verified case rate

Number of cases verified divided by the number of cases across all editions (expressed as a percentage)

Time verifying data

Time take to verify data (regardless of edition)

Verification raw error rate

Rate of changes in the raw data (value at each position) in verification across all editions. This tells you the proportion of errors detected (and corrected) during verification. If Ignore Literals is checked on the Data Entry Tailoring dialog, literals are assumed to be 100% accurate. Routing is not followed. Variables which are correctly marked as not asked are assumed to be 100% accurate. If text is inserted in an open response, subsequent characters will be marked as changed if they differ from the character previously in their new position.

Verification character error rate

Rate of changes of codes in multi-choice questions and characters in open-response questions during verification. If Ignore Literals is set on the Data Entry Tailoring dialog, literal variables are not included in the statistic. Routing is not followed. Variables which are correctly marked as not asked are assumed to be 100% accurate. If text is inserted in an open response, subsequent characters will be marked as changed if they differ from the character previously in their new position.

Case error rate

The proportion of verified cases where errors were found.

Number of key depressions

Number of keys pressed for keyed data entry and verification. This includes data entered during any addition, modification or cloning of data but not scanning keying/cleaning. Scanning keys are recorded separately below. It does not account for control key depressions such as Esc, Enter, Tab etc.

Number of cases keyed

Cases created by hand in data entry window i.e. keyed

Number of cases imported

Cases created by email import or database import

Number of cases edited

Cases created or edited via keyed data or imported entry or modified via verification but not scanning. Scanning cases are recorded separately below.

Raw data chars

Characters in rdf (raw data file) excluding spaces

Time editing data

Time spent creating, editing and verifying keyed data, not including any scanning time. Scanning times are recorded separately below. If more than 4 minutes is spent between key presses, timing is suspended until the next key press.

Key depressions per minute

Number of key presses for keyed data and verification divided by time to key and verify. This does not include any scanning keys or time. This is a measure of the speed performance of the operator.

Cases entered per hour

Number of new keyed cases divided by the time to key and verify. This is another measure of the speed performance of the operator.

Cases edited per hour

Number of cases edited divided by the total time spent editing data in an hourly basis. This is another measure of the speed performance of the operator.

Number of cases scanned

New cases created by detecting in scanning

Number of cases rescanned

Existing cases which have had been redetected in scanning

Time detecting scanned cases

Time for detecting scanned cases

Detected scanned cases per hour

Number of cases detected divided by the time for detecting.

Cases edited by keying/cleaning

Number of cases modified during keying/cleaning. Note that multiple passes through keying and cleaning may save the case multiple times.

Scanning key depressions

Number of key presses during keying/cleaning, including Enter and mouse clicks.

Time keying/cleaning scanned data

Time taken during keying and cleaning of the scanned data

Scanning key depressions per minute

Number of key presses (and mouse clicks) divided by the time taken for keying/cleaning. This is another measure of the speed performance of the operator.

Scanned cases edited per hour

Total number of scanned cases that have been keyed/cleaned divided by total time spent editing scanned data in an hourly basis. This is another measure of the speed performance of the operator.

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