操作员＆＃x2B; *和：在GLS功能中执行
我的代码看起来像这样：
Endo.v.Mass_Extant_Stages<-gls(log.Endo~log.Mb+Stage, data = CrocOntogenyData)
我的结果根据我使用的是 +，*或：在log.mb（连续）和阶段（分类）之间更改。有人真的知道这些运营商在做什么吗？我似乎找不到任何东西。
My code looks like this:
Endo.v.Mass_Extant_Stages<-gls(log.Endo~log.Mb+Stage, data = CrocOntogenyData)
My results change based on whether I'm using a +,*, or : between log.Mb (continuous) and Stage (categorical). Does anyone actually know what these operators are doing? I can't seem to find anything on it.
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R中的模型具有描述的特殊语法在这里/a>（您还可以在R中键入
help（公式））。它们不仅在GLS函数中使用（例如，lm也使用它们）。z〜x + y对于每个X和Y值的数学公式“ z = ax + by + c”，对于某些常数a，b，c。z〜x * y对每个X和Y值的数学公式“ z = ax + by + cxy + d”，对于某些常数a，b，c，d。z〜x / y < / code>对于每个X和Y值的数学公式“ z = ax + bxy + c”，对于某些常数a，b，c。z〜x：y对每个常数a的数学公式“ z = axy”。请参阅此堆栈交换发布有关更多信息
Models in R have a special syntax described here (you can also type
help(formula)into R). They aren't only used in the gls function (lmalso uses them, for instance).Z ~ x + ycorresponds to the mathematical formula "z = ax + by + c" for every x and y value, for some constants a, b, c.Z ~ x * ycorresponds to the mathematical formula "z = ax + by + cxy + d" for every x and y value, for some constants a, b, c, d.Z ~ x / ycorresponds to the mathematical formula "z = ax + bxy + c" for every x and y value, for some constants a, b, c.Z ~ x:ycorresponds to the mathematical formula "z = axy" for every x and y value, for some constant a.See this Stack Exchange post for more information