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Data and quality of data
Descripción
KS4 ICT Mapa Mental sobre Data and quality of data, creado por Matthew Stentiford el 12/04/2017.
Sin etiquetas
ict
ks4
Mapa Mental por
Matthew Stentiford
, actualizado hace más de 1 año
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Creado por
Matthew Stentiford
hace alrededor de 7 años
14
0
0
Resumen del Recurso
Data and quality of data
Data - raw facts/figures (no meaning)
Data + meaning = information
information + understanding = knowledge
Data can be numbers, words, pictures, videos and sounds
Data goes into a computer and useful information comes out
must be good quality
GIGO - Garbage in Garbage out
Incorrect data goes in = incorrect information comes out
Quality of data
Fit for purpose
Asking for someones religion is NOT fit for purpose
Accurate
incorrect items could be delivered if data isn't accurate
Up to date
Correct address so products can be delivered
Valid
Ordering food in B&Q won't be valid data
Non-biased
Collecting data from a random sample
Data validation
Data needs to have NO ERRORS
Validation spots the errors
Types of errors
Wrongly recorded
Data capture forms designed to minimise errors
entered incorrectly
double keyed or proof read
Could be changed by unauthorised personel
security (passwords)
Corrupted during transmition
encryption
checks data BEFORE processed
Data Verification
Checks data AFTER being processed
validation techniques
Range check
numerical data lies within an acceptable range
1-31 DAYS OF THE MONTH
presence check
is any data missing?
Format check
Data in correct format
Check digit
Calculation creates an extra digit
computer checks that the check digit is correct when data is entered
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