This document has a summary of all of the microlectures in it from part II of the course. The microlectures included are (in order from the weeks): 550, 553, 554, 560, 561, 563, 510, 545, 580 & 590.
PART TWO: INFERENTIAL STATISTICS
Unit 550: multivariate regression addition: the effect of two variables
Describing and testing the relationship between a dependent scale variable and two independent
variable a dummy and a ratio variable
Example: EQ emotional intelligence
Expectations:
Model: addition. Both education and family type both affect your intelligence.
There are also other models were there are 2 independent variables.
Combining the effect of education and type on EQ in one linear equation: addition
Dependent = intercept + verschil in lijnen * Family Type () + Beta1 (slope) education
Beta0 is altijd de slope. Beta1 is altijd de slope.
Beta 2 is the additional effect = verschil in lijnen.
When analyzing data, always check
1. Independent cases condition
2. Random selection of cases
3. (10% condition)
4. “Even distribution of the variables” (NNC)
,So in this case, check at least the distribution of the variables first.
A deterministic relationship is NOT expected
Randomness is displayed in a normal distribution. The errors will be normally/equally distributed.
Always check that the residuals are normal and equal across the lines and the groups.
If they are not equally distributed, we need another model.
t-test
General expectation: f-test: how likely it is that a mean from 0 is actually from a population where the
mean is actually zero.
T-test: difference between two means in a population. Also studying the mean over time. A lot of
means.
Conclusions?
Level of education is not having an effect while the family type does have an effect.
Unit 550, video 2: the effect of two ratio variables on another scale (ratio) variable
Describing & testing the relationship between a dependent scale variable & two independent ratio
variables
Example:
,In a ‘review study’ the units are (n) ‘papers’.
Combining the effect of education and age on ageism in one linear equation: addition
Taking ‘age’ to be the main effect to be displayed, how to visualize the additional effect of education?
We look at age first, and then look at the differences of education.
Education can be 0,1,2 ...?
, Both have a negative effect. Level of education goes down, level of ageism goes down.
The lines are parallel, the difference in the lines are the differences in the intercept.
Intercept: the level of ageism if both age and education are zero.
Checking residuals now becomes less easy using simple visual inspection: normality, equal variance.
In multiple regression, two types of expectations
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller caitlinbakker26. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $6.90. You're not tied to anything after your purchase.
