DATA

DATA

1. Method of Ensuring Data Correctness

   • Data Verification
     • (A method to check the input for errors)
       • Proof-Reading
         • The person entering the data simply reads through what they have entered to check it is correct or not. Usually checked with the original copy.
       • Double-Entry
         • The data is entered twice. The computer compares the data, and anything that doesn't match is questioned.
   • Data Validation (Is it logical?)
     • Presence- Check
       • It is a check to see if the data is entered.
         • E.G: You forgetting to type ponylover43@yahoo.com.sg in the E-mail section. Then there is a warning that says you need to type it in.
           • This is too basic for an answer. Better not write it as an answer.
     • Format-Check
       • It checks whether the data is in the correct format.
         • E..G:date should be in DD/MM/YYYY (Not like USA)
     • Check-Digit
       • Used for numerical data. An extra digit is added to a number which is calculated from the digits. The computer checks this calculation when data are entered
         • E.G: IDK
     • Character-Type Check
       • Character type check is a check to make sure only certain types of characters are in the data.
         • E.G: A name should not have numbers.
     • Range-Check
       • A range check is a check to make sure a number is within a certain range.
         • E.G: A driver's age should be 17 to 99.
           • When you fake your birthday and you still are not old enough for Facebook.

2. Data Process

   • Batch Processing
     • Batch processing is where the data is collected first, and then at a certain period of time, usually after a month, the data will be updated.
   • Real-time Process
     • Real-time Processing is where the data is collected and updated on the spot.

3. Data Collection

   • Open-Loop
     • Sensor
       • Analog to Digital Converter(ADC)
         • Computer
     • The sensor detects a change in value. Then, it will send a signal to the ADC, which will convert the signal from analog to digital for the computer to interpret. Then it will send a signal to the computer. The computer will display the signal, showing that there is a change in the value.

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