I have a dataframe for which I need to add a factor column based on a conditional statement. Here is the data.
我有一个数据帧,我需要根据条件语句添加一个因子列。这是数据。
Code:
码:
morstats.agri.f <- moroccostats[c("year","agVA_g","agVA_ppp_g")]
morstats.agri.f
Question:
题:
So, i want to add a column "periodframe" to the dataframe that has two entries: "pre-1991" and "post-1991" based on the condition for the column "year"?
那么,我想在数据框中添加一个“periodframe”列,它有两个条目:“1991之前”和“1991之后”,基于“年”栏的条件?
the dataframe looks like this:
数据框如下所示:
year agVA_g agVA_ppp_g
1 1960 0.00 0.000000000
2 1961 0.00 0.000000000
3 1962 0.00 0.000000000
4 1963 0.00 0.000000000
5 1964 0.00 0.000000000
6 1965 -0.13 -0.160505952
7 1966 0.09 0.065780672
8 1967 0.10 0.075941092
9 1968 -0.04 -0.064963044
10 1969 0.11 0.084530984
11 1970 0.19 0.161963328
12 1971 0.12 0.097397145
13 1972 0.19 0.160263118
14 1973 0.20 0.172040051
15 1974 0.01 -0.012005158
16 1975 0.14 0.111609284
17 1976 -0.02 -0.044823054
18 1977 0.32 0.299092259
19 1978 0.13 0.104535675
20 1979 0.20 0.171374920
etc.
等等
1 个解决方案
#1
42
you can use ifelse like this
你可以像这样使用ifelse
dataframe$periodframe <- ifelse(dataframe$year > 1991,"post-1991", "pre-1991")
#1
42
you can use ifelse like this
你可以像这样使用ifelse
dataframe$periodframe <- ifelse(dataframe$year > 1991,"post-1991", "pre-1991")