Association: contingency, correlation, and regression

12 important questions on Association: contingency, correlation, and regression

What is the response variable?

in a correlational studies, the response variable is the variable for which you want to explain the outcome. the values of the response variable are explained by the values of the explanatory valuable. the response variable is the dependent variable.

What is the explanatory variable?

the values explanatory variable are used to predict the valuables of the response variable. the explanatory variable is the independent variable.

In a scatter graph, where is the explanatory variable placed?

on the x-axis.
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When doe we speak of an association?

if a particular value of one variable is more likely to occur with certain values of another variable.

What is a contingency table?

a display (tabel) for two categorical variables it columns one variable on one end and rows one variable on the other. in the table are the amounts of observations made in each cross, column- row combination of variables.

What is the cross-tabulation of data?

the process of taking a data file and finding the frequencies for a contingency table.

What is a marginal proportion?

the proportion of the total of sampled items expressed in a decimal number.
de verhouding van het totaal kijkend vanaf de response variable.

Describe:
- the explanatory, and the response variable
- the conditional proportions
- the marginal proportions

- the job is explanatory, the phone is responsive.
- 2240/3171 en 386/1829
- 2626/5000 en 2374/5000

Wat is een marginal proportion?

de marginale proportie verwijst naar de verhouding van een specifieke gebeurtenis of uitkomst tot het totale aantal waarnemingen in een dataset of een subgroep, waarbij andere variabelen niet in beschouwing worden genomen. Het is een manier om de kans op een bepaalde gebeurtenis te meten zonder rekening te houden met andere factoren.

What is a scatterplot?

a graph of that visualizes the cells of a contingency table.

Describe the formula of r and describe all symbols

r= (1/(n-1))∑z(x)+z(y)
r is correlation
n is amount of observations
z(x) is z score of one variable
z(y) is z score of the other variable.

What is a quadrant?

when in a scatterplot 2 lines are put at the means of both variables, the quadrants are the four sections you get.

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