Data Management Data Verification Data Validation.

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Presentation transcript:

Data Management Data Verification Data Validation

Data Verification Double Entry Parallel Entry Verify against the original source

Double Entry Please Enter Your Password : ****** Re-enter your password : ****** Sorry! Not the same. Please re-enter!

Double Entry Please Enter Your Password : ****** Re-enter your password : ******

Parallel Entry

Verify with original Enter you student number : Correct ? Student Card No: Name: Chan ching Sex: F

Data Validation Type Check Range Check Presence Check Control Total Check Check Digit

Type Check Name : Le0n La1 Invalid

Range Check Date of birth : 32/13/1986 Invalid

Presence Check Date of birth : 23/3/1986 Name : Leon Lai Student Number: Sex : F Invalid

Control Total Check Total number of students in class = 40 Number of records processed = 39 DATA Invalid

Check Digit- weighted modulo 11 method Use the ID no E453712(x) as an example X = 14 * 11 - (5*8 + 4*7 +5*6 +3*5 + 7*4 + 1*3 + 2*2) = = 6 Weightings: Valid ID no = E453712( )6

Verification vs Validation Verification Make sure the data entered is the same as the source Validation Make sure the data entered meets the specified criteria Name must be letters Months must be 1 – 12 All necessary fields must be present e.g. student no. Numbers must match with the check digit

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