# Transition plot in R-change in time visualization

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Transition Plot in R, when we have quantitative data for change in time, visualization is straight forward but in the case of a categorical variable, it’s not as easy.

In this article, we are going to describe transition plots for categorical variables.

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## Approach 1:-

You can use plotmat function from the diagram package.

If you are not installed, let’s install the package.

install.packages("diagram") library(diagram) plotmat(transition_matrix[1:3,1:3])

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## Approach 2:-

Let’s load the package transition plot function from Gmisc package.

library(Gmisc) library(grid)

Let’s create a matrix for visualization,

no_boxes <- 3 transition_matrix <- matrix(NA, nrow = no_boxes, ncol = no_boxes) transition_matrix[1, ] <- 200 * c(.5, .25, .25) transition_matrix[2, ] <- 540 * c(.75, .10, .15) transition_matrix[3, ] <- 340 * c(0, .2, .80) transition_matrix [,1] [,2] [,3] [1,] 100 50 50 [2,] 405 54 81 [3,] 0 68 272

Let’s load the transition plot function and fill the box names

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## Transition plot in R

transitionPlot(transition_matrix, box_txt = c("First", "Second", "Third"), type_of_arrow = "simple", min_lwd = unit(1, "mm"), max_lwd = unit(6, "mm"), overlap_add_width = unit(1, "mm"))

Based on a transition plot function, visualizing time change is quick and provide more intuitive understanding. The lines indicates the transition from one particular group/level into the next.

library(RColorBrewer) output_perc <- function(txt, n) sprintf("%s\n[%.0f%%]", txt, n) box_txt <- cbind(mapply(output_perc, txt = c("First", "Second", "Third"), n = prop.table(rowSums(transition_matrix))*100), mapply(output_perc, txt = c("First", "Second", "Third"), n = prop.table(colSums(transition_matrix))*100)) transitionPlot(transition_matrix, box_label = c("Before", "After"), box_txt = box_txt, cex = 1.2, type_of_arrow = "simple")

You can add title while using **main, **box labels based on **box_label**, and customizing box text can using **box_txt**. The box_txt** **vector assumes the same text or label for both left and right boxes.

## Conclusion

The function transition plot is from Gmisc-package and it’s very handy when we need categorical time change visualization. The original idea was for transitionPlot is to show the before and after impact.

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