R：多个条件将两个调查问题（因素）归类为一个水平为None/Mild/Severe的因素

Question

我有两个因素 X 和 Y，有 5 个等级（5 分李克特量表）

"[1] Never"      "[2] Rarely"     "[3] Sometimes"  "[4] Often"      "[5] Very Often"

根据这两个答案，我想用以下编码创建一个新的因子 Z：

None：X = 从不，Y = 从不

轻度：X = 很少、有时、经常或非常经常，Y = 从不

严重：Y = 很少、有时、经常或非常经常

我尝试了很多不同的多重条件，但 none 成功了。

这是其中之一：

Z <- c("None", "Mild", "Severe")
    factor(Z)
    levels(Z) <- c("None", "Mild", "Severe")
    if (!is.na((X == 1) && (Y == 1))) {
      Z == "None"
      } else if (!is.na((X != 1) && (Y == 1))) {
        Z == "Mild"
        } else (!is.na((X != 1) && (Y != 1))) {
          Z == "Severe"
          }

错误信息是：

Error: unexpected '{' in:
"    Z== "Mild"
    } else (!is.na((X != 1) && (Y != 1))) {"
>       Z == "Severe"
[1] FALSE FALSE  TRUE
>       }
Error: unexpected '}' in "      }"
>

样本由大约 4000 人组成，我想根据他或她对问题 X 和 Y 的评分知道哪个参与者属于哪个类别（例如抑郁症）。

我还是个 R 初学者，非常感谢您的帮助！

一切顺利

Answer 1

这就够了吗？您可以使用三个逻辑向量对数据进行子集化。

如果您需要更多详细信息，使用您的一些数据会有所帮助。 (help)

lev <- c("Never", "Never", "Never", "Rarely", "Sometimes", "Often", "Very Often")

set.seed(1)

X <- factor(sample(c(lev, "Never"), 15, replace=TRUE), levels=unique(lev))
Y <- factor(sample(lev, 15, replace=TRUE), levels=unique(lev))

None <-   X %in% c("Never") & 
          Y %in% c("Never")

Mild <-   X %in% c("Rarely", "Sometimes", "Often", "Very Often") &
          Y %in% c("Never")

Severe <- Y %in% c("Rarely", "Sometimes", "Often", "Very Often")

如果你想将逻辑向量组合成一个单一的因子向量，可以这样做：

Z0 <- rbind(None, Mild, Severe)
z <- which(Z0, arr.ind=TRUE)
Z <- factor(rownames(z), levels=rownames(Z0))

data.frame(X, Y, Z)
#             X          Y      Z
# 1       Never     Rarely Severe
# 2       Never      Often Severe
# 3   Sometimes Very Often Severe
# 4       Never      Never   None
# 5       Never      Often Severe
# 6       Never Very Often Severe
# 7       Never      Never   None
# 8       Often  Sometimes Severe
# 9       Often      Never   Mild
# 10      Never      Never   None
# 11      Never      Never   None
# 12      Never      Never   None
# 13      Often      Never   Mild
# 14     Rarely Very Often Severe
# 15 Very Often      Never   Mild

R：多个条件将两个调查问题（因素）归类为一个水平为None/Mild/Severe的因素

R: Multiple conditions to categorise two survey questions (factors) into one factor with levels None/Mild/Severe

if-statement

r

multiple-conditions