好的，你要找的是累积平均值：
以下是ggplot版本：

outcome <- c(1, 1.2, 0.8, 0.9)
cumulative_mean <- cummean(outcome)

# Create a data frame with the cumulative means and their indices
df <- data.frame(cumulative_mean = cumulative_mean, index = 1:length(cumulative_mean))

# Plot the cumulative means
ggplot(df, aes(x = index, y = cumulative_mean)) +
  geom_point() +
  xlab("Index") +
  ylab("Cumulative Mean") +
  ggtitle("Cumulative Mean Plot")+
  theme_minimal()

这是R基版本：

plot(cumulative_mean, type = "p", xlab = "Step", ylab = "Cumulative Mean")