Eliminating confounding and discovering

6 important questions on Eliminating confounding and discovering

What is an inception cohort?

A designated group of persons assembled at a common time early in the development of a specific clinical disorder

What is the formula of simple regression?

Is a straight line with an intercept
outcome=model+error

How do you use effect modification in regression?

constant times*predictor 1*predictor 2
So for example
Knee Ext Stri = b0 + b1*Bodymass+ b2*Gender + b3*Bodymass*Gender
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How do you enter categorical variables into your regression model?

Recode them into dummy variables, choose a reference or the lowest or the highest

Assumptions for the regression model?

Variable types
Non-zero variance
No perfect multicollinearity
Predictors are uncorrelated with external variables
Homoscedasticity
Independent errors
Normally distributed errors
Independence
Linearity

What can you do if assumptions are violated?

Data transformation
Change model

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