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    <p>This is what I do. A darker colour indicates a more important combination of A and B.</p> <pre><code>dataset &lt;- data.frame(A = sample(LETTERS[1:5], 200, prob = runif(5), replace = TRUE), B = sample(LETTERS[1:5], 200, prob = runif(5), replace = TRUE)) Counts &lt;- as.data.frame(with(dataset, table(A, B))) library(ggplot2) ggplot(Counts, aes(x = A, y = B, fill = Freq)) + geom_tile() + scale_fill_gradient(low = "white", high = "black") </code></pre> <p>Or if you prefer lines</p> <pre><code>library(ggplot2) dataset &lt;- data.frame(A = sample(letters[1:5], 200, prob = runif(5), replace = TRUE), B = sample(letters[1:5], 200, prob = runif(5), replace = TRUE)) Counts &lt;- as.data.frame(with(dataset, table(A, B))) Counts$X &lt;- 0 Counts$Xend &lt;- 1 Counts$Y &lt;- as.numeric(Counts$A) Counts$Yend &lt;- as.numeric(Counts$B) ggplot(Counts, aes(x = X, xend = Xend, y = Y, yend = Yend, size = Freq)) + geom_segment() + scale_x_continuous(breaks = 0:1, labels = c("A", "B")) + scale_y_continuous(breaks = 1:5, labels = letters[1:5]) </code></pre> <p>This third options add labels to the data points using geom_text().</p> <pre><code>library(ggplot2) dataset &lt;- data.frame( A = sample(letters[1:5], 200, prob = runif(5), replace = TRUE), B = sample(LETTERS[20:26], 200, prob = runif(7), replace = TRUE) ) Counts &lt;- as.data.frame(with(dataset, table(A, B))) Counts$X &lt;- 0 Counts$Xend &lt;- 1 Counts$Y &lt;- as.numeric(Counts$A) Counts$Yend &lt;- as.numeric(Counts$B) ggplot(Counts, aes(x = X, xend = Xend, y = Y, yend = Yend)) + geom_segment(aes(size = Freq)) + scale_x_continuous(breaks = 0:1, labels = c("A", "B")) + scale_y_continuous(breaks = -1) + geom_text(aes(x = X, y = Y, label = A), colour = "red", size = 7, hjust = 1, vjust = 1) + geom_text(aes(x = Xend, y = Yend, label = B), colour = "red", size = 7, hjust = 0, vjust = 0) </code></pre>
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    1. POvisualize associations between two groups of data
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    1. COThanks Thierry, I would like some way to see the connections between each pair. So i can see what items in group A lead to items in group B. I am going to attach a dataset example.
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    2. COHere's the png for Thierry's second solution. http://i38.tinypic.com/2d0juw6.png
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      1. USChristopher DuBois
 

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