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Class 3 Notes -Variable Classisfication and Organizing data
(Based on: Vincent (2005) Chapter 1 and 2)
- Revisit Math Review - Answers to the practice problems (click here)
- Classification of Data
- Nominal –
- Ordinal –
- Interval –
- Ratio –
- Organizaing Data
- Simple Frequency Distribution
- Purpose to simply and organize data into a more useable form
- Example: 6 9 8 5 10 7 7 8 8 10
- Range = H - L
- X = the score values (x refers to a specifc score value)
- f = frequency of a score value
- Cumulative frequency (cf or cumf)
- Grouped Frequency Distribution
- With large N (> 20) and range of scores is too large (>20) … not really simplifying data.
- Interval size (how many scores on each line) i = Range/15
- Round to nearest odd number (preferred))
- Exception – multiples of 10 (20 better than 19 or 21, for instance)
- This should give you roughly15 steps
- Disadvantage –
- How to construct
- Determine interval size
- Start at bottom
- Lowest score in group
- Begin with multiple of interval size (i)
- Continue creating intervals (all steps will begin with a number which is a mulitple of the interval size)
- Tally scores like before
- Limits
- Apparent limits – integer values
- example:
- Real limits – due to rounding
- example:
REMINDERS -
Based on: Vincent, W. J. (2005). Statistics in kinesiology (3rd ed.). Champaign, IL: Human Kinetics.
- Purchase your textbooks and study chapters 1 and 2 in Vincent.
- Get your stat calculator and be sure to bring it to class on Wednesday (and to all classes/labs after that).
- For practice, complete problems 1-4 on page 35 of your text.
