# Statistics

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## ManuscriptChecklist < Main < Vanderbilt Biostatistics Wiki

Checklist for Authors | References | Editable References Design and Sample Size Problems Use of an improper effect size
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## Diagnostics: complete notes. Hadley's notes.

General modelling cycle is: fit examine residuals transform if necessary repeat above until happy Reasons for bad fit: non-planar data (major problem, coefficients effectively meaningless) non-constant scatter errors not independent outliers non-normal residuals Detecting non-planar data plot residuals versus fitted values, and residuals vs. variables partial residual plots fitting additive models

## FAQ: What are pseudo R-squareds?

You're not lost. We have a new look but the same content. FAQ: What are pseudo R-squareds? As a starting point, recall that a non-pseudo R-squared is a statistic generated in ordinary least squares (OLS) regression that is often used as a goodness-of-fit measure. In OLS, where N is the number of observations in the model, y is the dependent variable, y -bar is the mean of the y values, and y -hat is the value predicted by the model.

## How to: make a scatterplot with a smooth fitted line | FlowingDa

Maybe you have observations over time or it might be two variables that are possibly related. In either case, a scatter plot just might not be enough to see something useful. A fitted line can let you see a trend or relationship more easily.

## Ricci-refcard-ts.pdf (application/pdf Object)

Overview Binary logistic regression is a form of regression which is used when the dependent is a dichotomy and the independents are of any type. Multinomial logistic regression exists to handle the case of dependents with more classes than two, though it is sometimes used for binary dependents also since it generates somewhat different output described below. When multiple classes of a multinomial dependent variable can be ranked, then ordinal logistic regression is preferred to multinomial logistic regression since ordinal regression has higher power for ordinal data. Note that continuous variables are not used as dependents in logistic regression. Unlike logit regression, there can be only one dependent variable.

Bayes

## Ed231C: Model Fit

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