# Research methods- Level of measurement, 1/2 data Flashcards

When does data have a nominal scale of measurement?

When the data can be placed or counted into different categories, which are mutually exclusive and the category labels are only names, so there is no order of the categories

What are 2 examples of nominal data?

1) Red vs White roses

2) Smokers vs non-smokers

When does data have a ordinal level of measurement?

Involves data which is ranked in order or on a scale which may have labels)- differs from nominal as categories of scale can be placed in order

Ordinal= subjective and differences between each point on scale are not same value

What is are 2 examples of ordinal data?

1) Rate 5 foods in preference order

2) Very confident, confident etc scale

When does data have an interval level of measurement?

Involves measurements that can be ordered & the intervals on the scale are equal because they are based on a standard unit of measurement- but point to indicate 0 is arbitrary

What is an example of interval data?

IQ scores

When does data have a ratio level of measurement?

Similar to interval, but there is a genuine 0 point, so ratio statements can be made

What are 3 examples of ratio data?

1) Height in cm

2) Weight in kgs

3) Time in seconds

What measures of central tendency/dispersion can be used for nominal data?

Mode

What measures of central tendency/dispersion can be used for ordinal data?

Median & mode

What measures of central tendency/dispersion can be used for interval data?

Mean, mode, median, range, IQR, standard deviation

What measures of central tendency/dispersion can be used for ratio data?

Mean, mode, median, range, IQR, standard deviation

What is the most powerful measure of central tendency?

Mean

When should you not use the mean?

If there are outliers

What is primary data?

Information that is observed or collected directly from first-hand experience specifically for the aims and/or hypothesis of the study