9059 2011-02-182.81 9060 2011-02-21<NA> 9061 2011-02-222.72 9062 2011-02-232.75 9063 2011-02-242.73
I have a data frame that looks like: > ta ranks ompALLA1 15124772.9 210242769.9 320481914.2 4256开发者_如何学JAVA 8932.3
I\'m trying to load data into a data frame in R from a state education Access database. The database provi开发者_StackOverflow中文版des information about schools in the state, and each school has a 12
In my dataframe I select only variables test3-test8 data[,grep(\'(test[3-8]+$)\',names(data)),] Now I want to replace \"1\" with \"2\". According to df[ df == \"1\" ]开发者_如何学编程 = \"2\" I tri
I have the followingdataframe andwish to extract all rows corresponding to the same group with status==1.
Let me try this again, I\'m going to leave out the exact data/example and just walk through what I need to accomplish.
I’d like to ask you a question again. It is basically about data frames, NAs and tabulate function in [R].
I have a simple questioon I think. In my dataframe I would like to make subset where column Quality_scoreis equal to: Perfect, Perfect*, Perfect*, Good, Good** and Good***
The output of a time-series looks like a 开发者_开发知识库data frame: ts(rnorm(12*5, 17, 8), start=c(1981,1), frequency = 12)
I built an rpart tree model and now I want to extract the used variables in this model out of a big prediction dataframe (over 7.000 variables), because I have to to some calculations on this predicti
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