316 Exam 3 Real Flashcards
What type of bivariate is contingency table?
Nominal or ordinal
What type of bivariate is correlation coefficient?
Interval ratio
Depends on absolute value
Correlation coefficient
Can be portrayed as slope
Correlation coefficient
Chi squared is
Nominal
1 SD is what percent?
68%
2 SD is what percent?
95%
3 SD is what percent?
99%
Calculates the probability that the correlation between 2 variables is not zero.
Pearson’s r as an inferential statistic
T tests compare
2 means
T test for two groups
Independent T test
T test for before and after
Dependent t test
To compare more than 2 means use
ANOVA
Bivariate descriptive statistic (2)
Contingency table/crosstabs
Correlation Coefficient/Pearson’s R
A single descriptive statistic that estimates the population value
Point estimation
A range of values within which a population value probably lies
Interval estimation
The probability that a population value is within a certain range
Confidence interval
Type 1 error is when you
Falsely reject the null
By convention, power (beta) should be
.80
Larger sample =
Greater power
Effect size is denoted as Cohen’s
d
Indexes used to assess risk
OR
Absolute risk
The ratio of people with an adverse rxn to those without
Odds Ratio (OR)
Odds is not the same as
Probability
For odds something vs odds something …
OR/OR
OR greater than 1
Increased risk group one compared to group two
OR = 1
No difference between two groups
Analyzes relationships between a nominal dependent variable and one or more independent variables
Logistic Regression
Logistic regression yields a
Log odds ratio
When you hear Linear Regression, think
Line of Best Fit
Logistic Regression vs Linear Regression
Nominal/Categorical variables vs I/R variables
