R
!!!errorbar
!平均±標準誤差
!標準誤差の計算
 se = sd/sqrt(項目数)

!!先に平均とSEを計算しておく

{{pre
```{r}
library(dplyr)

sugi_iwa_mean_sd_se <- sugi_iwa.dat %>% 
  group_by(cond, time) %>% 
  summarise(mean=mean(score), sd=sd(score), se=sd/sqrt(20))
```

```{r}
g <- ggplot(sugi_iwa_se)
g <- g + aes(x=time, y=mean, color=cond)
g <- g + geom_line()
g <- g + geom_errorbar(aes(ymin=mean-se, ymax=mean+se))
plot(g)
```
}}
!!ggplotの式の中で計算する
{{pre
g <- ggplot(sugi_iwa.dat)
g <- g + aes(x=time, y= score, color=cond)
g <- g + geom_point()
g <- g + geom_jitter(width = 0.05)
g <- g + facet_grid(rows = vars(cond))
g <- g + stat_summary(fun = mean,
               fun.min = function(x) mean(x) - sd(x), 
               fun.max = function(x) mean(x) + sd(x), 
               geom = "pointrange", color="black", size=0.7)
g <- g + stat_summary(fun = mean,
               geom = "line", width=2) 

plot(g)
}}