原来The Catcher in Rye并不是讲稻草人和乌鸦的故事，是中二少年失败的离家出走尝试。如果我中二期看的这书，应该会很喜欢吧。虽然现在也挺喜欢的。更奇
Chapter 2 Chapter 3 Wrong way to set color Aesthetics Can Be Mapped per Geom Save plots Chapter 4 Group data and the “Group” Aesthetic Facet to make small multiples Geoms can transform data Histgrams and Density Plots Avoid Transformations When Necessary Chapter 2 geom_point
p <- ggplot(data = gapminder, mapping = aes(x = gdpPercap, y = lifeExp)) p + geom_point() Chapter 3 geom_smooth
Chapter 5 Use Pipes to Summerize Data Continuous Variables by Group or Category Write and Draw in the Plot Area Scales, Guides, and Themes Chapter 5 Use Pipes to Summerize Data rel_by_region <- gss_sm %>% group_by(bigregion, religion) %>% summarize(N = n()) %>% mutate(freq = N / sum(N), pct = round((freq*100), 0)) ## Warning: Factor `religion` contains implicit NA, consider using ## `forcats::fct_explicit_na` rel_by_region ## # A tibble: 24 x 5 ## # Groups: bigregion [4] ## bigregion religion N freq pct ## <fct> <fct> <int> <dbl> <dbl> ## 1 Northeast Protestant 158 0.
本书第一章主要对一些术语进行了界定，把元分析同其它种文献综述的方式进行了区分。元分析同其它定性的总结以及定量的（Informal vote count
Bosons make up one of the two classes of particles, the other being fermions.
So far, we have some hints and some ideas about what the smallest distance in the universe might be (the Planck length). We have a pretty good catalog of twelve matter particles that so far we haven’t been able to break further apart (the Standard Model). And we have a list of three possible ways that these particles can interact (the electroweak and strong forces and gravity).