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我正在学习R中的地层采样,并试图运行地层功能。每次我尝试运行此函数时遇到同样的错误 - 当我从教授提供的课程笔记中运行strata()时,运行来自?strata的示例 - 下面是来自help(strata)和错误消息的示例我收到,当我尝试运行它。我感到困惑。无论我运行哪个阶层(),我都会得到相同的错误消息 - 任何想法如何克服?任何建议表示赞赏。无法运行R中的地层()
# Uses the 'swissmunicipalities' data as population for drawing a sample of units
data(swissmunicipalities)
# the variable 'REG' has 7 categories in the population
# it is used as stratification variable
# Computes the population stratum sizes
table(swissmunicipalities$REG)
1 2 3 4 5 6 7
589 913 321 171 471 186 245
# do not run
# 1 2 3 4 5 6 7
# 589 913 321 171 471 186 245
# sort the data to obtain the same order of the regions in the sample
data=swissmunicipalities
data=data[order(data$REG),]
# the sample stratum sizes are given by size=c(30,20,45,15,20,11,44)
# 30 units are drawn in the first stratum, 20 in the second one, etc.
# the method is simple random sampling without replacement
# (equal probability, without replacement)
st=strata(data,stratanames=c("REG"),size=c(30,20,45,15,20,11,44), method="srswor")
错误在地层(数据,stratanames = C( “REG”),大小= C(30,20,45,15, :所有参数必须具有相同的长度
# extracts the observed data
getdata(data, st)
错误is.vector(米):对象 'ST' 未找到
# see the result using a contingency table
table(st$REG)
在表
错误(ST $ REG):对象“ST”未找到
它正在为我工作。我没有看到任何错误消息。 –