我一直在尝试从data列中生成一个虚拟变量作为时间间隔。 样本数据
Date <- seq(as.Date("1988-01-01"),as.Date("2018-12-31"),by="1 day")
DATASET <- data.frame(rnorm(11323),Date)
我想创建一个间隔：20-04：20-08，每年的代码为1。对于执行此操作的代码，我将不胜感激。
如何为日期间隔创建虚拟变量
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问答
ai520119 回答：如何为日期间隔创建虚拟变量
您可以比较一年中的某天。在基数R中应该是
DATASET$day_of_year <- as.integer(format(DATASET$Date,"%j"))
DATASET$flag <- +(with(DATASET,ifelse(as.integer(format(Date,"%Y")) %% 4 == 0,day_of_year %in% 111:233,day_of_year %in% 110:232)))
对于leap年20-04是一年的第111天，而20-08是第233天，对于其余年份，它们分别是110和232。当日期介于这两个值之间时，我们将分配1。
,也许您可以尝试使用以下代码获取每年20-4和20-8之间的时间间隔的代码
DATASET <- within(DATASET,code <- ave(as.numeric(format(DATASET$Date,"%m%d")),as.numeric(format(DATASET$Date,"%Y")),FUN = function(x) ifelse(x>=420 & x <=820,1,0)))
一小部分结果如下所示
> DATASET
rnorm.11323. Date code
1 -0.326546058 1988-01-01 0
2 -0.561589735 1988-01-02 0
3 -0.417091199 1988-01-03 0
4 -0.482488496 1988-01-04 0
5 0.039820482 1988-01-05 0
6 -0.285270230 1988-01-06 0
7 -1.301004464 1988-01-07 0
8 1.835118221 1988-01-08 0
9 -0.207213889 1988-01-09 0
10 1.695089989 1988-01-10 0
11 -0.618905489 1988-01-11 0
12 1.689917961 1988-01-12 0
13 -0.272349252 1988-01-13 0
14 0.585059685 1988-01-14 0
15 -0.793666725 1988-01-15 0
16 -0.276084733 1988-01-16 0
17 -0.474363507 1988-01-17 0
18 1.703568414 1988-01-18 0
19 0.011776841 1988-01-19 0
20 0.029492096 1988-01-20 0
21 -1.313446231 1988-01-21 0
22 -0.127952381 1988-01-22 0
23 -0.203861769 1988-01-23 0
24 -0.365669967 1988-01-24 0
25 -0.239937083 1988-01-25 0
26 0.620562975 1988-01-26 0
27 0.652111601 1988-01-27 0
28 -0.869191381 1988-01-28 0
29 0.130085565 1988-01-29 0
30 0.059768397 1988-01-30 0
31 0.349921562 1988-01-31 0
32 -1.087277224 1988-02-01 0
33 -1.250976040 1988-02-02 0
34 -0.970337410 1988-02-03 0
35 2.063232550 1988-02-04 0
36 -0.294777997 1988-02-05 0
37 0.535559649 1988-02-06 0
38 -0.229363577 1988-02-07 0
39 -1.819158790 1988-02-08 0
40 1.020335484 1988-02-09 0
41 0.102285275 1988-02-10 0
42 1.254992570 1988-02-11 0
43 1.584044869 1988-02-12 0
44 -0.629629933 1988-02-13 0
45 -1.073561540 1988-02-14 0
46 1.273920124 1988-02-15 0
47 -0.376367657 1988-02-16 0
48 1.331066300 1988-02-17 0
49 0.694872356 1988-02-18 0
50 0.863826292 1988-02-19 0
51 -1.411795778 1988-02-20 0
52 0.388793450 1988-02-21 0
53 -0.216112938 1988-02-22 0
54 -0.196632011 1988-02-23 0
55 0.558895841 1988-02-24 0
56 0.818765192 1988-02-25 0
57 -1.250469812 1988-02-26 0
58 0.803231988 1988-02-27 0
59 0.002634810 1988-02-28 0
60 0.252328475 1988-02-29 0
61 -0.958851197 1988-03-01 0
62 -1.448732431 1988-03-02 0
63 0.647314543 1988-03-03 0
64 0.644802476 1988-03-04 0
65 -0.087973096 1988-03-05 0
66 1.088076864 1988-03-06 0
67 -0.293465532 1988-03-07 0
68 0.141825697 1988-03-08 0
69 0.413649305 1988-03-09 0
70 -1.877052966 1988-03-10 0
71 -2.200275448 1988-03-11 0
72 -0.025524427 1988-03-12 0
73 1.236501510 1988-03-13 0
74 -0.872516837 1988-03-14 0
75 -1.063727523 1988-03-15 0
76 0.264564444 1988-03-16 0
77 0.971958801 1988-03-17 0
78 0.102470655 1988-03-18 0
79 1.369131551 1988-03-19 0
80 -0.041148284 1988-03-20 0
81 -2.476135538 1988-03-21 0
82 0.836740451 1988-03-22 0
83 0.078102241 1988-03-23 0
84 -0.949778901 1988-03-24 0
85 -0.975874102 1988-03-25 0
86 2.011305586 1988-03-26 0
87 1.441333862 1988-03-27 0
88 1.404182762 1988-03-28 0
89 -0.425158054 1988-03-29 0
90 1.250722900 1988-03-30 0
91 0.060629220 1988-03-31 0
92 -1.593162931 1988-04-01 0
93 0.475640908 1988-04-02 0
94 0.102547315 1988-04-03 0
95 -2.350611181 1988-04-04 0
96 0.185065822 1988-04-05 0
97 0.463470128 1988-04-06 0
98 1.722202344 1988-04-07 0
99 -1.344383635 1988-04-08 0
100 0.858491817 1988-04-09 0
101 -0.008338174 1988-04-10 0
102 0.572599035 1988-04-11 0
103 0.138858045 1988-04-12 0
104 -1.808541857 1988-04-13 0
105 1.308927384 1988-04-14 0
106 -2.374371017 1988-04-15 0
107 1.134519340 1988-04-16 0
108 1.604437740 1988-04-17 0
109 -0.109549779 1988-04-18 0
110 -0.011355562 1988-04-19 0
111 -1.462229758 1988-04-20 1
112 1.006583367 1988-04-21 1
113 -0.124824926 1988-04-22 1
114 1.611795681 1988-04-23 1
115 0.818715370 1988-04-24 1
116 -0.440445043 1988-04-25 1
117 0.024114452 1988-04-26 1
118 -1.418044894 1988-04-27 1
119 -0.632317886 1988-04-28 1
120 0.599948691 1988-04-29 1
121 1.055118998 1988-04-30 1
122 0.301676490 1988-05-01 1
123 -0.662547532 1988-05-02 1
124 0.425191055 1988-05-03 1
125 1.715003304 1988-05-04 1
126 -0.298346044 1988-05-05 1
127 -1.043983256 1988-05-06 1
128 -1.194283503 1988-05-07 1
129 -1.517810914 1988-05-08 1
130 0.386735460 1988-05-09 1
131 0.742102056 1988-05-10 1
132 0.953762078 1988-05-11 1
133 -0.602941007 1988-05-12 1
134 1.469329252 1988-05-13 1
135 -0.233230972 1988-05-14 1
136 0.663378860 1988-05-15 1
137 -0.749108544 1988-05-16 1
138 0.591009181 1988-05-17 1
139 0.013732152 1988-05-18 1
140 -0.774612526 1988-05-19 1
141 -1.707183964 1988-05-20 1
142 -0.808360648 1988-05-21 1
143 1.420371293 1988-05-22 1
144 0.603838459 1988-05-23 1
145 0.743964804 1988-05-24 1
146 0.059498235 1988-05-25 1
147 -0.597795793 1988-05-26 1
148 0.867167938 1988-05-27 1
149 0.441291857 1988-05-28 1
150 1.348769636 1988-05-29 1
151 -1.768938126 1988-05-30 1
152 1.070400122 1988-05-31 1
153 0.321542409 1988-06-01 1
154 -0.495030342 1988-06-02 1
155 -0.740337974 1988-06-03 1
156 -1.887552572 1988-06-04 1
157 0.805602475 1988-06-05 1
158 -0.824104379 1988-06-06 1
159 0.801460489 1988-06-07 1
160 -0.912871263 1988-06-08 1
161 -0.422677222 1988-06-09 1
162 0.126785279 1988-06-10 1
163 -0.598578319 1988-06-11 1
164 -1.535492985 1988-06-12 1
165 0.018486996 1988-06-13 1
166 -1.156209268 1988-06-14 1
167 0.656276068 1988-06-15 1
168 0.045640396 1988-06-16 1
169 0.627538985 1988-06-17 1
170 2.640792582 1988-06-18 1
171 -0.383475408 1988-06-19 1
172 -2.631633446 1988-06-20 1
173 0.772980776 1988-06-21 1
174 1.930884904 1988-06-22 1
175 2.026248604 1988-06-23 1
176 -0.134588724 1988-06-24 1
177 -0.593768442 1988-06-25 1
178 -0.427553478 1988-06-26 1
179 0.303955588 1988-06-27 1
180 -0.195481230 1988-06-28 1
181 1.231190798 1988-06-29 1
182 -0.871672993 1988-06-30 1
183 -1.002028081 1988-07-01 1
184 -0.912352588 1988-07-02 1
185 -0.714319398 1988-07-03 1
186 0.053181016 1988-07-04 1
187 0.865163557 1988-07-05 1
188 0.474865269 1988-07-06 1
189 -1.105410939 1988-07-07 1
190 -0.110529764 1988-07-08 1
191 -0.805821554 1988-07-09 1
192 -1.550774659 1988-07-10 1
193 -0.508057551 1988-07-11 1
194 -0.755394814 1988-07-12 1
195 0.993023957 1988-07-13 1
196 -0.342427853 1988-07-14 1
197 -1.481690158 1988-07-15 1
198 -0.095168751 1988-07-16 1
199 1.320208464 1988-07-17 1
200 -0.340080090 1988-07-18 1
201 -1.545902324 1988-07-19 1
202 0.389589474 1988-07-20 1
203 -0.734778233 1988-07-21 1
204 0.296933278 1988-07-22 1
205 -0.024469569 1988-07-23 1
206 1.261660247 1988-07-24 1
207 -0.136786252 1988-07-25 1
208 0.908519533 1988-07-26 1
209 1.576193030 1988-07-27 1
210 0.413044482 1988-07-28 1
211 -0.601938271 1988-07-29 1
212 0.495905040 1988-07-30 1
213 0.440665366 1988-07-31 1
214 -0.804152825 1988-08-01 1
215 -1.065705237 1988-08-02 1
216 0.149246056 1988-08-03 1
217 -0.530891226 1988-08-04 1
218 -0.879233155 1988-08-05 1
219 -0.262727374 1988-08-06 1
220 -2.244552614 1988-08-07 1
221 -1.531707789 1988-08-08 1
222 1.498847169 1988-08-09 1
223 0.810096179 1988-08-10 1
224 -1.690822775 1988-08-11 1
225 0.303456055 1988-08-12 1
226 -0.874022497 1988-08-13 1
227 0.244933676 1988-08-14 1
228 1.220193574 1988-08-15 1
229 -0.456840188 1988-08-16 1
230 1.083075786 1988-08-17 1
231 -1.769152445 1988-08-18 1
232 -1.038850200 1988-08-19 1
233 0.963345582 1988-08-20 1
234 0.036574589 1988-08-21 0
235 -2.613751531 1988-08-22 0
236 1.441930677 1988-08-23 0
237 -1.927433949 1988-08-24 0
238 -0.045661284 1988-08-25 0
239 0.974935858 1988-08-26 0
240 -1.457985965 1988-08-27 0
241 0.914085417 1988-08-28 0
242 -0.004152904 1988-08-29 0
243 1.653886738 1988-08-30 0
244 0.972947047 1988-08-31 0