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Description
DATA
1 Method of
Ensuring
Data
Correctness
1.1 Data Verification
1.1.1 (A method to check the input for errors)
1.1.1.1 Proof-Reading
1.1.1.1.1 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.
1.1.1.2 Double-Entry
1.1.1.2.1 The data is entered twice.
The computer compares the
data, and anything that
doesn't match is questioned.
1.2 Data
Validation (Is it
logical?)
1.2.1 Presence- Check
1.2.1.1 It is a check
to see if the
data is
entered.
1.2.1.1.1 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.
1.2.1.1.1.1 This is
too basic
for an
answer.
Better
not
write it
as an
answer.
1.2.2 Format-Check
1.2.2.1 It checks whether the
data is in the correct
format.
1.2.2.1.1 E..G:date
should be in
DD/MM/YYYY
(Not like USA)
1.2.3 Check-Digit
1.2.3.1 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
1.2.3.1.1 E.G:
IDK
1.2.4 Character-Type
Check
1.2.4.1 Character type
check is a check to
make sure only
certain types of
characters are in
the data.
1.2.4.1.1 E.G: A name should not have
numbers.
1.2.5 Range-Check
1.2.5.1 A range check is a
check to make sure
a number is within
a certain range.
1.2.5.1.1 E.G: A driver's age should be 17 to 99.
1.2.5.1.1.1 When you fake your birthday and
you still are not old enough for
Facebook.
2 Data Process
2.1 Batch Processing
2.1.1 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.
2.2 Real-time Process
2.2.1 Real-time
Processing is
where the data is
collected and
updated on the
spot.
3 Data Collection
3.1 Open-Loop
3.1.1 Sensor
3.1.1.1 Analog to Digital
Converter(ADC)
3.1.1.1.1 Computer
3.1.2 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.
3.2
