Data - After 2nd Midterm Flashcards
Mastery
- Continuous variable: …
- Size of golf ball is … measure
- # of golf ball’s is …, Lego bricks are …
- The volume of water in a container is … measurement
- Discreet variable: ….
- Continuous variable: measurement can be refined depending upon the precision of your measurement instrument. A golf ball (GB) can be no smaller than 42.67mm (a biathlon target is only 45mm.. At 50 m away, laying on snow…)
- Size of golf ball is continuous measure
- The volume of water in a container is continuous measurement
- Discreet variable: measurement cannot be broken down into fractions. You cannot count 3 and ½ penguins..
- # of golf ball’s is discreet, Lego bricks are discreet
*1. Nominal Scale
* A scale in which objects or individuals are…
* … variable
* Numbers can represent the label of a category (elephants = 3)
* In a study of ethnicity in professional football, categorizing Latin Americans “1”, African Americans as “2”, Asian Americans as “3”, etc
Variables: Nominal Scale
*1. Nominal Scale
* A scale in which objects or individuals are assigned to categories that have no numerical properties
* Categories according to a criterion
* Discrete variable
* Numbers can represent the label of a
category (elephants = 3)
* In a study of ethnicity in professional football, categorizing Latin Americans “1”, African Americans as “2”, Asian Americans as “3”, etc
Classifying of Variables: Discrete or Continuous?
* Height
* Religion
* Blood pressure
* VO2max
* Number of children in a family
* Number of times you use your phone per day
* Number of minutes you use your phone per day
Variables: Ordinal Scale
* what is it…
* … variable
* Many clinical measures use this
* Distance between values…
* Relative position within …
Variables: Ordinal Scale
* Categories that are ranked
* Discrete variable
* Many clinical measures use this
* Distance between values is not necessarily equal
* Relative position within a distribution
- Interval Scale
* A scale in which the units of measurement….
* Has direction and magnitude, and …
Variables: Interval Scale
* …. distance between values
Faces were grouped as unattractive or attractive: nominal, ordinal, interval, ratio?
Alcohol consumption 0%, 3%, or 6% in beverage: nominal, ordinal, interval, ratio?
- … variable
- Examples:
- IQ Scores: …
CAN YOU HAVE NEGATIVE VALUES?
- Interval Scale
* A scale in which the units of measurement (intervals) between the numbers on the scale are equal in size BUT there is no absolute zero or true zero
* Has direction and magnitude, and equal distance between values
Variables: Interval Scale
* Equal distance between values
Faces: nominal
Alcohol: ordinal
- … variable
- Examples:
- IQ Scores: The differences between scores are consistent and meaningful (e.g., the difference between an IQ of 100 and 110 is the same as between 110 and 120), but there is no true zero point that represents a complete lack of intelligence.
YES YOU CAN HAVE A NEGATIVE
- Ratio Scale
* A scale that has…
* There is an…
* … variable
* Reaction time to a stimuli is ratio – 1 second is 1/10 of 10 seconds and theoretically, 0 seconds would be no response.
eg.
concentration, pulse, weight, length, temperature in Kelvin
- Ratio Scale
* A scale that has magnitude, direction, and equal units of measurement.
* There is an absolute zero that indicates an absence of the variable.
* Continuous variable
* Reaction time to a stimuli is ratio – 1 second is 1/10 of 10 seconds and theoretically, 0 seconds would be no response.
interval - continuous
ratio - discrete
ordinal/ ratio - discrete
ordinal - discrete
nominal - discrete
interval - continuous
ordinal - discrete
nominal - discrete
