Week 13 Flashcards
What is base N
The total number of cases in a distribution
What is bimodal distribution
A distribution that has two nonadjacent categories with about the same number of cases, and these categories have more cases than any other categories
What is chi square
An inferential statistic used to test hypotheses about relationships between two or more variables in a cross tabulation
What is correlation coefficient (r)
A summary statistic that varies from 0-1 or -1 with 0 indicting the absence of a linear relationship between two quantitative variables and 1 or -1 indicating that the relationship is completely described by the line representing the regression of the dependent variable on the independent variable
What is cross tabulation.
A bivariate (two-variable) distribution showing the distribution of one variable for each category of another variable
What are descriptive statistics
Statistics used to describe the distribution of and relationship among variable
What is elaboration analysis
The process of introducing a third variable into an analysis in order to better understand - to elaborate - the bivariate (two-variable) relationship under consideration; additional control variable also can be introduced
What are frequency distributions
Numerical display showing the number of cases, and usually the percentage of cases (the relative frequencies) corresponding the each value or group of values of a variable
What is gamma
A measure of association sometimes used in cross-tabular analyses
What is grouped frequency distribution
A frequency distribution in which the data are organised into categories, either because there are more values than can be easily displayed or because the distribution of the variable will be clearer or more meaningful
What is histogram
A graphic for quantities variables in which the variables distribution is displayed with adjacent bars
What is interquartile range
The range in a distribution between the end of the first quartile and the beginning of the third quartile
What is marginal distributions
The summary distributions in the margins of a cross tabulation that correspond to the frequency distribution of the row variable and of the column variable
What is mean
The arithmetic or weighted, average, computed by adding up the value of all the cases and dividing by the total number of cases
What is measure of association
A type of descriptive statistics that summarise the strength of an association
What is median
The position average or the point that divides a distribution in half
What is mode
The most frequent value in a distribution also termed the probability average
What is monotonic relationship
A pattern of association in which the value of cases on one variable increases or decreases fairly regularly across the categories of another variable
What is negatively skewed
A distribution in which cases cluster to the right side and the left tail of the distribution is longer than the right
What is positively skewed
Describes a distribution in which the cases cluster to the left and the right tail of the distribution is longer than the left
What are quartiles
The points in a distribution corresponding to the first 25% of the cases, the first 50% of the cases and the top 25% of the causes
What is regression analysis
A statistical technique for characterising the pattern of s relationship between two quantitative variables in terms of a linear equation and for summarising the strength of this relationship
What is skewness
A feature of a variables distribution, referring to the extent to which cases are clustered more at one or the other end of the distribution rather than around the middle
What is standard deviation.
The square root of the average squared deviation to each case from the mean
What are subtables
Tables describing the relationship between two variable within the discrete categories of one or more other control variables
What is unimodal distribution
A distribution of a variable in which there is only one value that is more frequent
