## ----include = FALSE----------------------------------------------------------
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  fig.width = 7,
  fig.height = 5,
  fig.alt = "Map of North Carolina counties shaded by Bayesian surprise values."
)

## ----setup--------------------------------------------------------------------
library(bayesiansurpriser)
library(sf)
library(ggplot2)

## ----basic-sf-----------------------------------------------------------------
# Load North Carolina SIDS data
nc <- st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)

# Compute surprise: observed SIDS cases vs expected (births)
result <- surprise(nc, observed = SID74, expected = BIR74)

# View the result
print(result)

## ----plot-ggplot--------------------------------------------------------------
# Plot surprise values with ggplot2
ggplot(result) +
  geom_sf(aes(fill = surprise)) +
  scale_fill_surprise() +
  labs(title = "Bayesian Surprise: NC SIDS Data (1974)")

## ----plot-signed--------------------------------------------------------------
# Plot signed surprise (shows direction of deviation)
ggplot(result) +
  geom_sf(aes(fill = signed_surprise)) +
  scale_fill_surprise_diverging() +
  labs(title = "Signed Surprise: Over/Under-representation")

## ----output-details-----------------------------------------------------------
# Access surprise values directly
get_surprise(result, "surprise")[1:5]

# Access the model space
get_model_space(result)

## ----custom-models------------------------------------------------------------
# Create custom model space
custom_space <- model_space(
  bs_model_uniform(),
  bs_model_baserate(nc$BIR74),
  bs_model_gaussian(),
  prior = c(0.2, 0.5, 0.3)  # Custom prior weights
)

result_custom <- surprise(nc, observed = SID74, expected = BIR74,
                          models = custom_space)
print(result_custom)