| 查看: 471 | 回复: 1 | ||
[求助]
R求助
|
|
最近用R处理数据，有以下几个问题问高手: 1,You used a linear model. This assumes that your data (the residuals) are normally distributed? If not, have you tried to transform the residuals so that they are normally distributed? If residuals are not normally distributed and cannot be transformed so that they become normally distributed, have you tried a generalized linear model (GLM) with an appropriate error structure (given by the "family"-command in glm - in R: model <- glm (y ~ x), family= "gaussian / binomial / Gamma / etc."  对于统计数据中有缺失的部分，我一律用R代替，请问如何判断这些数值的出现是否为"gaussian / binomial / Gamma ？还是要一个一个尝试？ gaussian / binomial / Gamma 怎么体现在R语句中？具体怎么操作？ 2, What y and what x did you use in "lm(formula = y ~ x)"? You can use several explanatory variables (x) in a lm or glm but only one response variable (y)? 3,With the ratio of annual species and perennial species, I suggest that you use the logarithm of this ratio: log (annuals / perennials) - this is usually done with ratio-data 对于较小的数值（0—1之间），一般取log，请问是取什么为底的函数？10，2， 还是e? 谢谢！ |
回复此楼» 猜你喜欢
这年头没有找到涵评专家，还有中面上的可能吗
已经有7人回复
-
青C资助名额大幅增加！
已经有12人回复
-
重磅！青年科学基金项目（C类）资助增幅预计超过50%
已经有6人回复
-
有带发论文的吗
已经有3人回复
-
导师各种操作恶心咋办
已经有13人回复
-
本人最近太闲了，谁有问题可以提，每天会统一回复
已经有12人回复
-
护理论文 晋升
已经有5人回复
-
求助大佬sci投稿哪个好中
已经有4人回复
-
评审感受-评审感受-评审感受
已经有14人回复
-
2026博士申请求助
已经有10人回复
2楼2013-11-01 13:44:25