Regressiemodel

Nu is het tijd om een eenvoudig lineair regressiemodel te bouwen voor het gewicht (Weight) van 20-jarigen op basis van Height. Hiervoor moeten we eerst het designobject NHANES_design filteren zodat het alleen 20-jarigen bevat, terwijl we de oorspronkelijke designstructuur behouden.

Deze oefening maakt deel uit van de cursus

Enquêtedata analyseren in R

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Oefeninstructies

Gebruik subset() om een nieuw designobject, NHANES20_design, te maken dat alleen de 20-jarigen bevat.
Bouw met svyglm() een eenvoudig lineair regressiemodel voor Weight op basis van Height met het designobject NHANES20_design en sla dit op als mod.
Print een samenvatting van het model.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

# Subset survey design object to only include 20 year olds
NHANES20_design <- subset(___, Age == ___)

# Build a linear regression model
mod <- svyglm(___ ~ ___, design = ___)

# Print summary of the model
___(___)

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Deze oefening maakt deel uit van de cursus

Enquêtedata analyseren in R

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Our exploration of survey data will begin with survey weights. In this chapter, we will learn what survey weights are and why they are so important in survey data analysis. Another unique feature of survey data are how they were collected via clustering and stratification. We'll practice specifying and exploring these sampling features for several survey datasets.

Exercise 1: What are survey weights?Exercise 2: Survey weights Exercise 3: Visualizing the weights Exercise 4: Specifying elements of the design in R Exercise 5: Designs in R Exercise 6: Stratified designs in R Exercise 7: Cluster designs in R Exercise 8: Comparing survey weights of different designs Exercise 9: Visualizing the impact of survey weights Exercise 10: NHANES weights Exercise 11: Tying it all together!

Now that we have a handle of survey weights, we will practice incorporating those weights into our analysis of categorical data in this chapter. We'll conduct descriptive inference by calculating summary statistics, building summary tables, and constructing bar graphs. For analytic inference, we will learn to run chi-squared tests.

Exercise 1: Visualizing a categorical variable Exercise 2: Summarizing a categorical variable Exercise 3: Interpreting frequency tables Exercise 4: Graphing a categorical variable Exercise 5: Exploring two categorical variables Exercise 6: Creating contingency tables Exercise 7: Building segments bar graphs Exercise 8: Summarizing with svytotal()Exercise 9: Interpreting svymean()Exercise 10: Inference for categorical variables Exercise 11: Running a chi squared test Exercise 12: Tying it all together!

Of course not all survey data are categorical and so in this chapter, we will explore analyzing quantitative survey data. We will learn to compute survey-weighted statistics, such as the mean and quantiles. For data visualization, we'll construct bar-graphs, histograms and density plots. We will close out the chapter by conducting analytic inference with survey-weighted t-tests.

Exercise 1: Summarizing quantitative data Exercise 2: Survey statistics Exercise 3: Estimating quantiles Exercise 4: Visualizing quantitative data Exercise 5: Bar plots of survey-weighted means Exercise 6: Output of svyby()Exercise 7: Bar plots with error Exercise 8: Survey-weighted histograms Exercise 9: Survey-weighted density plots Exercise 10: Inference for quantitative data Exercise 11: Survey-weighted t-test Exercise 12: Tying it all together!

To model survey data also requires careful consideration of how the data were collected. We will start our modeling chapter by learning how to incorporate survey weights into scatter plots through aesthetics such as size, color, and transparency. We'll model the survey data with linear regression and will explore how to incorporate categorical predictors and polynomial terms into our models.

Exercise 1: Visualiseren met spreidingsdiagrammen Exercise 2: Bubbelplots Exercise 3: Spreidingsdiagrammen met enquêtegewichten Exercise 4: Gebruik van kleur in spreidingsdiagrammen Exercise 5: Trends visualiseren Exercise 6: Best passende lijn Exercise 7: Trendlijnen Exercise 8: Surveygegevens modelleren Exercise 9: Regressiemodel

Huidige oefening

Exercise 10: Regressie-inferentie Exercise 11: Complexer modelleren Exercise 12: Meervoudige lineaire regressie Exercise 13: Alles bij elkaar brengen Exercise 14: Afronding