**Modelwordcloud** is a package that makes a word cloud out of text, primarially based on the associations between that text and a predictive model.

```
data(iris)
model <- lm(Petal.Width ~ Species, iris)
summary(model)
```

```
##
## Call:
## lm(formula = Petal.Width ~ Species, data = iris)
##
## Residuals:
## Min 1Q Median 3Q Max
## -0.626 -0.126 -0.026 0.154 0.474
##
## Coefficients:
## Estimate Std. Error t value Pr(>|t|)
## (Intercept) 0.24600 0.02894 8.50 1.96e-14 ***
## Speciesversicolor 1.08000 0.04093 26.39 < 2e-16 ***
## Speciesvirginica 1.78000 0.04093 43.49 < 2e-16 ***
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## Residual standard error: 0.2047 on 147 degrees of freedom
## Multiple R-squared: 0.9289, Adjusted R-squared: 0.9279
## F-statistic: 960 on 2 and 147 DF, p-value: < 2.2e-16
```

As we can see, setosa (represented by the intercept) is the least associated with Petal.Width, wheras virginica is the most associated.

We can show this in a word cloud:

```
words_and_freqs <- rle(as.character(iris$Species))
freqs <- words_and_freqs$lengths
words <- words_and_freqs$values
coefficients <- model$coefficients
colors <- c("red", "orange", "blue") # Least associated gets red, most associated gets blue.
library(modelwordcloud)
wordcloud(words = words, freq = freqs, coefficients = coefficients, colors = colors)
```

You can also pass in the model object directly, if desired.

```
wordcloud(model, colors = colors)
```

This package can be installed from CRAN:

```
install.packages("modelwordcloud")
```

This work is based upon the wordcloud package by Ian Fellows, available from CRAN with the LGPL-2.1 license. This derivative work modified the original wordcloud package library by adding in logic to color words based on an additional variable, `coefficients`

. The code was also cleaned, re-styled, and simplified. This package also removed some unneeded functionality from the wordcloud package, such as a C library for calculating overlap.

- the colormap package helps produce large color palletes for use with
`wordcloud`

.

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