正文 085：卡方检验和贝叶斯定理(第1页/共3页)
山间小路，曲径通幽。
李罗根家看起来很近，感觉就在对面的小山腰，但是孔书成和李瑞云两人从湖边一座木桥上绕过去，却花了七八分钟。
就在两人快到李罗根家门口时，一条膘肥体壮的大黑狗，突然从旁边的竹林中窜了出来。那条如黑虎一般的大狗动作非常迅猛，冲着前面孔书成就要扑过去。
突然，李瑞云大喝一声：“卡方，你傻了嘛？连我都不认识了？”
那只条大黑狗，听见熟悉的声音后，立刻停止了攻击，转而走向李瑞云，并且欢快地摇起尾巴来。此刻，孔书成早已被它吓出一身冷汗。
李瑞云微微蹲下身子，轻轻拍了一下大黑狗：“去吧，卡方，一边玩去。”
孔书成站在一旁，胆战心惊地吃瓜。
李瑞云朝他笑了笑：“不用怕，它就看着吓人。”
孔书成挺了挺胸：“呵呵，我一般也不怎么怕狗的，只是它长得实在很凶，感觉脸都是方的，好像一只黑虎啊。哦对了，你刚才叫它什么来着？”
“卡方，它的名字叫卡方。”
“卡方？”
孔书成觉得这名字，倒是有些独特。听着耳熟，就是想不起来在哪里听过。
“它这个名字，也是我小叔给它取的。我小叔说，它的狗头看起来有点儿方，像是被门卡了一样，所以就管它叫卡方。哦对了，孔书成，你知不知道，卡方检验还是一个数学专有名词？”
“数学专有名词？”
李瑞云微笑：“是的。卡方检验，其实是用途非常广的一种假设检验方法，它一般是在分类资料统计推断中的应用。其中包括：两个率或两个构成比比较的卡方检验；多个率或者多个构成比比较的卡方检验以及分类资料的相关分析等。其实很简单，卡方检验就是统计样本的实际观测值与理论推断值之间的偏离程度，实际观测值与理论推断值之间的偏离程度就决定卡方值的大小………”
“李教授，别说了，我不知道什么叫做‘比比较’，我只知道自己比较笨。”
“呃………”
李瑞云尬笑一下，有关“卡方检验”的解释，对于孔书成来说的确是超纲了。
孔书成：“李教授，坦白说，我就只看过一部葛大爷主演的电影，叫作《卡拉是条狗》。可万万没想到，卡方也是一条狗啊。”
“哈哈，孔书成，你这人可真逗。哦对了，以后不要叫我李教授了，听着好老气。再说，我也没到那个境界。”说话间，李瑞云叩响了小叔
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