biostats week 4 review

biostats review week 4

Slide 3 - Another Way to Consider Variability

pearson's correlation is a way we describe the connection between 2 NUMERIC varibales

Slide 8 - • Properties of 𝑟

corellation tells you the direction not the strength

Slide 11 - Linear Regression

linear regression helps to determine target and create models and predict (the ads knowing a girl was pregnant before father did)

y, response, x, explanatory

1 unit increase in x determines in y

Slide 12 - Linear Regression • The slope of a regression...

Slide 13 - Linear Regression

plug in 400 for x since it is the explanatory variable

Slide 14 - Linear Regression

Slide 15 - Types of Random Sampling?

Slide 16 - Types of Random Sampling?

Slide 18 - What differentiates Experimental and...

keyword: sampling frame

keep experimental randomized

observational may be more confounding

Slide 19 - Study Designs

cohort studies have one control where they DONT have outcome/outcome free and prospective

case control is retrospective and the control is based on when they HAVE VS DONT HAVE, essentially throwback thursday

Slide 20 - Study Designs

recall bias

Slide 21 - Which study design allows us to make claims...

experimental designing with random treatment designing helps make claims about causation

Slide 22

blinding: when the experimenter doesn't know the treatment, the person doesn't know the treatment, or/and when the statician doesn't know the treatment

MATCHED AND THING ALREADY OCCURRED= RETROSPECTIVE= CASE CONTROL

Slide 23

Slide 25

we want RANDOM, TREATMENT ASSIGNMENT OF TWO GROUPS WHO ARE SIMILAR, FOR CAUSAL CLAIMS

Slide 26 - Variable Types

Slide 30 - Histograms and Shape of a Distribution • Data...

Slide 32 - Frequency Distributions

frequency is the count relative frequency is the percent

Slide 33

Slide 34 - Measures of Center?

Slide 37 - Which measure of center should I use? • The...

range, iqr, variance, standard deviation

Slide 39 - • Measures of variability are used to describe...

VARIANCE in squared

Slide 41 - • Which measure of variability is a resistant...

Slide 45 - What’s included in the 5 number summary?

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