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# PSCI 2702

### Quantitative Research Methods

TermDefinition
Nominal Level of Measurement Cannot rank or do mathematical calculations. Can only find mode. Example: sex (female or male)
Ordinal Level of Measurement Can rank and compare variables. Can only calculate median and mode. Example: Education levels
Interval Level of Measurement Can calculate mode, median and mean. All calculations are possible Example: Income
What is the mode? How do you find it? is the most frequent value example: ddccaaa - A is the mode. If these are grades, this shows that it favors smarter students.
What is the median? How do you find it? is the exact middle of the distribution. N = number of values (state if its even or odd number of values) RANK order before you calculate!
The Normal Distribution Where mean = median = mode Note: the tails of the curve represent the outliers with extreme scores for both measures and therefore the highest frequency is clustered around the average.
Positively Skewed Distribution Where mean>median>mode Note: long tail to the right means extreme values where this inflates the mean. This means that median encompasses average better than mean.
Negatively Skewed Distribution Where mean<median<mode Note: long tail to the left means extreme low values which inflate the mean thus we use the median as a measure of central tendency.
Created by: avelineking
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