Chatmade II Flashcards
(15 cards)
What is the main difference between logistic regression and linear regression?
Logistic regression is used for binary outcomes and predicts probabilities using the logit function; linear regression predicts continuous outcomes using a straight-line relationship.
When would you use a MANOVA instead of a standard ANOVA?
When you have two or more related dependent variables and want to test them together across groups.
Why is Poisson regression more appropriate than linear regression for modeling count data?
Because Poisson regression models non-negative integer counts and assumes the mean equals the variance, which is typical for count data.
What kind of variable is used as the outcome in a Chi-Square Test of Independence?
A categorical variable.
What is a nested ANOVA and when is it appropriate?
A test used for hierarchical data (e.g., students within classrooms), accounting for non-independence within nested groups.
What test compares fish counts from different rivers, each sampled multiple times?
Nested ANOVA.
What test examines if plant height is affected by both soil type and sunlight?
Two-Way ANOVA.
What test compares group means while adjusting for a continuous variable like temperature?
ANCOVA (Analysis of Covariance).
What kind of regression is used when the outcome is the number of events per time period?
Poisson regression.
What test is used to predict a binary outcome like heart disease (yes/no) from a predictor?
Logistic regression.
Why is it problematic to run multiple ANOVAs instead of a MANOVA?
It increases Type I error; MANOVA accounts for correlations and tests multiple DVs together.
What does a significant interaction in Two-Way ANOVA mean?
The effect of one factor depends on the level of the other.
What can you do if ANOVA assumptions (like equal variances) are violated?
Use Welch’s ANOVA, transform the data, or use a non-parametric test like Kruskal-Wallis.
Why are repeated observations in repeated measures ANOVA not treated as independent?
Because they come from the same subject and are likely correlated.
When would ANCOVA provide better results than ANOVA?
When you want to compare group means while controlling for a continuous covariate like socio-economic status.
