获得“NA"当我运行标准偏差时 [英] Getting "NA" when I run a standard deviation

问题描述

快速提问.我将我的 csv 文件读入变量 data.它有一个列标签 var，其中包含数值.

Quick question. I read my csv file into the variable data. It has a column label var, which has numerical values.

当我运行命令时

sd(data$var)

我明白了

[1] NA 

而不是我的标准偏差.

instead of my standard deviation.

你能帮我弄清楚我做错了什么吗?

Could you please help me figure out what I am doing wrong?

推荐答案

尝试 sd(data$var, na.rm=TRUE) 然后将忽略列 var 中的任何 NA.还将支付检查您的数据以确保 NA 应该是 NA 并且没有读取错误，命令如 head(data)、tail(data) 和 str(data) 应该对此有所帮助.

Try sd(data$var, na.rm=TRUE) and then any NAs in the column var will be ignored. Will also pay to check out your data to make sure the NA's should be NA's and there haven't been read in errors, commands like head(data), tail(data), and str(data) should help with that.

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