Logisitic Regression Flashcards
What differentiates LR from MR?
LR has a dependent variable that is binary
LR is used for predicting group membership
The Independent variables in a Logistic Regression should be
Continuous or binary
What are key differences between ANOVA and logistic regression?
The DV is binary for LR and not for ANOVA
What are the key differences between Chi Square and Logistic Regression
Chi Square has two catergorical variables
What are the key differences between t-tests and Logistic Regression
Continous IV variable and 2+ groups
What are the key differences between correlation and Logistic Regression
correlations are two continous variables, pearsons r or dichotomous variables
Is it possible to use a continuous variable for use in Logistic regression?
Yes, if the IV has a cut point and this can be used to form a binary variable
What is the general shape of a plotted logistic regression formula?
An S shape
What is the general shape of a quadratic function
A parabola
What is the scale of the DV for the logistic regression model?
A logarithmic scale
Is binary logistic regression a linear model?
No, it is non-linear function
Can the approach used for MR model building be used for LR?
Yes, it can use standard, sequential and statistical model building
How many ordinal outcomes can a multinomial logistic regression predict?
Three or more categories
Which type of LR is this lecture about?
Binary
Sequential logistic regression is what?
Binary and continuous variables are entered in blocks and pre-specified by the researcher
What does target variable mean?
This is the outcome category of the dependent variable that is the focus of the research question
What is the reference category in logistic regression analyses?
It is the reference category used to interpret the categories of a categorical variable
How does SPSS choose the target category for an outcome variable in a logistic regression?
It chooses the highest numeric value
Can a categorical DV have more than one category in logistic regression?
Categorical DVs in logistic regression can only have two values
Can a categorical IV have more than one category?
Categorical IVs in a logistic regression can have two or more values
For an IV with more than one category, can any category be the reference category?
Yes, any category can be the reference variable
When checking the linearity assumption in logistic regression we are doing the following:
There is linear relationship between the independent variables
What statistic is recommended to interpret model fit and can also be used as pseudo measure of R2?
The -2 Log Likelihood
An odds ratio > 1 means what?
Outcome is more likely for target level of IV
An odds ratio < 1 means what?
Outcome is less likely for target level of IV
An odds ratio = 1 means what?
No difference between groups
The odds ratio is also referred to as what?
Exp(B)
Odds ratios should always be interpreted in the context of what?
Prevalence
