chp.10 Flashcards
4 steps from data collection to sumamry:
Collect the data
Deal with data errors/omissions
Reduce data to manageable size
Develop summaries
what is data?
collective units of information from a subject or case
measured by a data collector following consistent
procedures
raw and unprocessed
what does consistency make data?
verifiable, but not necessarily truthful
2 types of data
primary
secondary
primary data
data the research collects to address the specific
problem at hand
secondary data
originally collected to address a problem other than the
one which require the manager’s attention at the
moment
6 dimensions of data quality
accuracy
consistency
validity
completeness
uniqueness
integrity
accuracy
the level to which data represents the real-world scenario and confirms with a verifiable source
consistency
represents if the same information stored and used at multiple instances matches.
Expressed as the percent of matched values across various records.
validity
signifies that the value attributes are available for aligning with the specific domain or requirement.
completeness
measures if the data is sufficient to deliver meaningful inferences and decisions
uniqueness
indicates if it is a single recorded instance in the data set used. Ensures no duplication or
overlaps.
integrity
indicates that the attributes are maintained correctly, even as data gets stored and used in
diverse systems. Ensures that all enterprise data can be traced and connected.
measurement
assigning numbers to empirical events, objects or properties, or activities in compliance with a set of rules.
what’s a mapping rule
scheme for assigning numbers to aspects of an empirical event
4 most used classifications of measurement
nominal - male or female
ordinal - low/middle/high income
interval - 13 degrees
ratio - defined 0 point eg lbs or $
4 characteristics of mapping rules
classification
order
distance
origin
classification
numbers are used to group or sort responses.
order
numbers are ordered. One number is greater than, less than, or equal to another number.
distance
differences between numbers can be measured.