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[[FrontPage]]
*Understanding Statistics in Corpus Linguistics [#cf852098]
**Understanding Statistics in Corpus Linguistics [#cf852098]
-Variables
--categorical
---binary (2 categories)
---multiple (n > 2): (a) nominal vs. (b) ordinal
--quantitative
---interval
---discrete
**Another aspect of variables: [#x6bfd7ee]
-explanatory/predictor/independent variables
-response/outcome/dependent variables
**Univariate vs. Bivariate analyses [#c85829ac]
-univariate
--an examination of a single variable
**Concept of "significance" [#u10790cf]
-Difference in proportions
-significance = a difference that is sufficiently large enough to trust it
***Null Hypothesis [#lcc1139e]
-There is no particular difference
***Expected frequencies [#a23f67b4]
-the frequencies we WOULD get if the two proportions are identical. Both probabilities equal 0.5
**Chi-square [#t18709d3]
-sum of the squared differences between obser[ved and expected frequencies, divided by the expected frequency, across all cells
-The probability of chi-square statistic is known for each number of degrees of freedom [number of groups -1]