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[英]How can I calculate mean and sd by group and format as dataframe?
[英]How can I input missing sd in a dataframe and then enforce NAs on the column sd automatically as a function into a new data frame?
這是我正在嘗試做的事情:
df=data.frame(m=runif(500,0,100),n=round(runif(500,1,100),sd=runif(500,1,25))
head(df)
df$sd=as.data.frame(lapply(df[3],function(cc)cc[sample(c(TRUE,NA),prob=c(0.85,0.15),size=length(cc),replace=TRUE)]))
NaS=which(is.na(df),arr.ind=TRUE)[,1]
NaM=noquote(paste0(NaS,sep=","))
xm=df[c(...),1]
xm
xn=df[c(...),2]
xn
Simdf=data.frame(xm,xn)
希望我能正確理解您,但似乎您只希望其中is.na(df$sd) == TRUE
的m
和n
列? 我只用它的subset
:
df=data.frame(m=runif(500,0,100),n=round(runif(500,1,100)),sd=runif(500,1,25))
head(df)
df$sd=as.data.frame(lapply(df[3],function(cc)cc[sample(c(TRUE,NA),
prob=c(0.85,0.15),size=length(cc),
replace=TRUE)]))
df_NA <- subset(df, is.na(sd))
R> head(df_NA)
m n sd
8 0.8887 85 NA
20 86.1660 71 NA
26 46.9202 83 NA
48 84.4475 41 NA
51 4.8426 3 NA
53 61.7181 92 NA
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