| 3 | Battle of the Green Fork | 298 | 4 | Robb Stark | Joffrey/Tommen Baratheon | Stark | NaN | NaN | NaN | Lannister | NaN | NaN | NaN | loss | pitched battle | 1 | 1 | 18000 | 20000 | Roose Bolton, Wylis Manderly, Medger Cerwyn, H... | Tywin Lannister, Gregor Clegane, Kevan Lannist... | 1 | Green Fork | The Riverlands | NaN |
| 4 | Battle of the Whispering Wood | 298 | 5 | Robb Stark | Joffrey/Tommen Baratheon | Stark | Tully | NaN | NaN | Lannister | NaN | NaN | NaN | win | ambush | 1 | 1 | 1875 | 6000 | Robb Stark, Brynden Tully | Jaime Lannister | 1 | Whispering Wood | The Riverlands | NaN |
| 3 | Battle of the Green Fork | 298 | 4 | Robb Stark | Joffrey/Tommen Baratheon | Stark | NaN | NaN | NaN | Lannister | NaN | NaN | NaN | loss | pitched battle | 1.0 | 1.0 | 18000.0 | 20000.0 | Roose Bolton, Wylis Manderly, Medger Cerwyn, H... | Tywin Lannister, Gregor Clegane, Kevan Lannist... | 1.0 | Green Fork | The Riverlands | NaN |
| 4 | Battle of the Whispering Wood | 298 | 5 | Robb Stark | Joffrey/Tommen Baratheon | Stark | Tully | NaN | NaN | Lannister | NaN | NaN | NaN | win | ambush | 1.0 | 1.0 | 1875.0 | 6000.0 | Robb Stark, Brynden Tully | Jaime Lannister | 1.0 | Whispering Wood | The Riverlands | NaN |
@@ -237,7 +237,7 @@ y = np.random.normal(0, 1.5, 20)
想象一下单样本 T 检验,并绘制一个“正态形状的”山丘,以`1`为中心,并以`1.5`为标准差而“展开”,然后在`0`处放置一个标志并查看标志在山丘上的位置。它靠近顶部吗? 或者远离山丘? 如果标志靠近山丘的底部或更远,则 t 检验的 p 值将低于`0.05`。
```
```py
# 运行 T 检验来检验 x 的均值和 0 相比,是否有统计学显著的差异
pvalue=stats.ttest_1samp(x,0)[1]
...
...
@@ -251,7 +251,7 @@ pvalue
想象一下单样本 T 检验,并根据标准差绘制两个(正态形状的)山丘,以它们的均值为中心,并根据他们的标准差绘制它们的“平坦度”(个体延展度)。 T 检验考察了两座山丘重叠的程度。 它们基本上是彼此覆盖的吗? 山丘的底部几乎没有碰到吗? 如果山丘的尾部刚刚重叠或根本不重叠,则 t 检验的 p 值将低于 0.05。
```
```py
stats.ttest_ind(x,y)[1]
# 0.00035082056802728071
...
...
@@ -265,7 +265,7 @@ stats.ttest_ind(x, y, equal_var=False)[1]