barY Mark • mosaicr

library(mosaicr)

The barY mark creates vertical bar charts. It draws rectangular bars from a baseline (typically zero) to the specified y value.

Basic Example

# Sample data
data <- data.frame(
  category = c("A", "B", "C", "D", "E", "F", "G", "H"),
  value = c(2, 8, 3, 7, 5, 4, 6, 1)
)

spec <- list(
  plot = list(
    list(
      mark = "barY",
      data = list(from = "sample_data"),
      x = "category",
      y = "value",
      fill = "steelblue"
    )
  )
)

mosaic(spec, sample_data = data)

Customization Options

Color by Category

spec_colored <- list(
  plot = list(
    list(
      mark = "barY",
      data = list(from = "sample_data"),
      x = "category",
      y = "value",
      fill = list(column = "category")
    )
  )
)

mosaic(spec_colored, sample_data = data)

Grouped Bars

# Sample data with groups
grouped_data <- data.frame(
  category = rep(c("A", "B", "C", "D"), each = 2),
  group = rep(c("Group 1", "Group 2"), times = 4),
  value = c(2, 3, 8, 6, 3, 4, 7, 5)
)

spec_grouped <- list(
  plot = list(
    list(
      mark = "barY",
      data = list(from = "grouped_data"),
      x = "category",
      y = "value",
      fill = list(column = "group")
    )
  )
)

mosaic(spec_grouped, grouped_data = grouped_data)

Use Cases

Categorical Data: Perfect for displaying values across discrete categories
Comparisons: Easy to compare values between different categories
Frequency Counts: Ideal for showing counts or frequencies of categorical data
Survey Results: Commonly used for displaying survey response distributions