inst/shinyApps/Bias/bias-explain.md

In farfallawang/mosaicApps: A toolkit for teaching applied math and stats

output: html_document: keep_md: yes

This applet allows users to see that a linear model will be drastically different with different terms in it. A confidence interval is only applicable to its own model or hypothesis test, it is not universally valid.

A model is created from the data set and the model given by expr. This is the way you specify "reality" for the purpose of the app.

Using the check boxes, you can add new terms or delete terms from the model, producing a model that deviates from the reality you created. The "real" model coefficient is plotted as a dotted line on each number line. The confidence interval and coefficient for the model indicated by the check-boxed terms is plotted in red.

The user may vary the confidence level and may vary the number of data points resampled to change the placement and size of the confidence intervals. There is also a original data checkbox which disables the n points to sample slider, as original data is used. When original data is checked as well as only the terms in the original model, the confidence intervals should align with the original predictions. There is a random seed slider to set the random seed. By default its initial value is random.

farfallawang/mosaicApps documentation built on May 16, 2019, 10:09 a.m.