Kwantiëlen schatten

Naast het gemiddelde zijn we ook geïnteresseerd in een kwantiel zoals het 50e kwantiel (oftewel de mediaan). Onthoud dat het 50e kwantiel de waarde is die groter is dan 50 procent van de data. Door de kwantiëlen van de data te verkennen, krijg je een beter beeld van hoe het aantal uren slaap is verdeeld onder Amerikanen. Terwijl de mediaan iets vertelt over het midden van onze populatie, wil je misschien ook weten hoeveel slaap de onderste 1% (1e kwantiel) of de bovenste 1% (99e kwantiel) meestal krijgt.

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Enquêtedata analyseren in R

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# Compute the survey-weighted quantiles
svyquantile(x = ___, 
            design = NHANES_design, 
            na.rm = TRUE, 
            quantiles = ___)

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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: Kwantitatieve gegevens samenvatten Exercise 2: Enquête-statistieken Exercise 3: Kwantiëlen schatten

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Exercise 4: Kwantitatieve gegevens visualiseren Exercise 5: Staafdiagrammen van enquête-gewogen gemiddelden Exercise 6: Uitvoer van svyby()Exercise 7: Staafdiagrammen met foutmarges Exercise 8: Histogrammen met enquêtegewichten Exercise 9: Steekproefgewogen dichtheidsplots Exercise 10: Inferentie voor kwantitatieve data Exercise 11: Enquête-gewogen t-toets Exercise 12: Alles bij elkaar brengen!

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: Visualization with scatter plots Exercise 2: Bubble plots Exercise 3: Survey-weighted scatter plots Exercise 4: Use of color in scatter plots Exercise 5: Visualizing trends Exercise 6: Line of best fit Exercise 7: Trend lines Exercise 8: Modeling survey data Exercise 9: Regression model Exercise 10: Regression inference Exercise 11: More complex modeling Exercise 12: Multiple linear regression Exercise 13: Tying it all together Exercise 14: Wrap-up