在频率表中包括零频率以获取李克特数据

问题描述：

我有一个数据集，该数据集以9pt的比例对李克特项目做出了回应.我想创建数据的频率表(和条形图)，但是刻度中的某些值从未出现在我的数据集中，因此table()从频率表中删除该值.我希望它以0的频率显示值.也就是说，给定以下数据集

I have a dataset with responses to a Likert item on a 9pt scale. I would like to create a frequency table (and barplot) of the data but some values on the scale never occur in my dataset, so table() removes that value from the frequency table. I would like it instead to present the value with a frequency of 0. That is, given the following dataset

# Assume a 5pt Likert scale for ease of example
data <- c(1, 1, 2, 1, 4, 4, 5)

我想获得以下频率表，而不必手动插入值为0的名为3的列.

I would like to get the following frequency table without having to manually insert a column named 3 with the value 0.

1 2 3 4 5 
3 1 0 2 1

我是R的新手，所以也许我忽略了一些基本知识，但是我没有遇到能够提供所需结果的函数或选项.

I'm new to R, so maybe I've overlooked something basic, but I haven't come across a function or option that gives the desired result.

答

table生成列联表，而tabular生成包含零计数的频率表.

table produces a contingency table, while tabular produces a frequency table that includes zero counts.

tabulate(data)
# [1] 3 1 0 2 1

另一种方式(如果您具有从1开始的整数-但在其他情况下很容易修改):

Another way (if you have integers starting from 1 - but easily modifiable for other cases):

setNames(tabulate(data), 1:max(data))  # to make the output easier to read
# 1 2 3 4 5 
# 3 1 0 2 1

在频率表中包括零频率以获取李克特数据

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