spi: Standardized Precipitation Index

Description Usage Arguments Value Author(s) See Also Examples

Description

Calculates the Standardized Precipitation Index (SPI) on a daily or monthly precipitation serie.

Usage

1
spi(object, period = 3, distribution = "Gamma")

Arguments

object

a daily or monthly precipitation serie.

period

the number of months to be aggregated in the calculation of the standardized precipitation index. (Default value: 3)

distribution

it has no effect yet. (Default value: "Gamma")

Value

A data.frame (precintcon.spi) containing the following variables:

Author(s)

Lucas Venezian Povoa lucasvenez@gmail.com

See Also

precintcon.plot.spi read.data

Examples

1
2
3
4
5
6
7
##
# Loading the monthly precipitation serie.
data(monthly)

##
# Performing the Standardized Precipitation Index
spi(monthly, period = 3)

Example output

Loading required package: ggplot2
Loading required package: scales
    year month          spi
3   1950     3 -1.715216076
4   1950     4 -0.006591791
5   1950     5  0.354215681
6   1950     6  1.313418282
7   1950     7  0.348769746
8   1950     8 -0.336807606
9   1950     9 -1.113102453
10  1950    10 -0.970787476
11  1950    11 -0.119738117
12  1950    12 -0.934152338
13  1951     1  0.273755343
14  1951     2  0.347032810
15  1951     3  0.684998486
16  1951     4  0.530933371
17  1951     5 -0.005280760
18  1951     6  0.190188268
19  1951     7 -0.438535063
20  1951     8  1.072410355
21  1951     9  0.825555839
22  1951    10  1.810567703
23  1951    11  0.987477957
24  1951    12  1.249176927
25  1952     1 -0.042259689
26  1952     2 -0.369957569
27  1952     3  0.458212890
28  1952     4  1.304453686
29  1952     5  1.050344572
30  1952     6  0.134645121
31  1952     7 -0.766530085
32  1952     8 -1.266492498
33  1952     9 -0.713102842
34  1952    10 -0.840899267
35  1952    11 -0.719132656
36  1952    12 -0.650596869
37  1953     1 -0.018696741
38  1953     2  0.393584188
39  1953     3  0.560686419
40  1953     4  0.239342313
41  1953     5 -0.078781417
42  1953     6 -0.095806067
43  1953     7  0.112479970
44  1953     8 -0.072686600
45  1953     9 -0.465116948
46  1953    10 -1.038526785
47  1953    11 -1.134270508
48  1953    12  0.111698961
49  1954     1  0.380109318
50  1954     2 -0.505144392
51  1954     3 -2.145835485
52  1954     4 -2.065733393
53  1954     5 -2.034160050
54  1954     6 -2.093869875
55  1954     7 -1.349284645
56  1954     8 -0.890497479
57  1954     9 -0.556971500
58  1954    10 -1.570185026
59  1954    11 -1.425464598
60  1954    12 -1.062083995
61  1955     1 -0.499916121
62  1955     2  0.178972529
63  1955     3 -0.092160754
64  1955     4 -0.859837188
65  1955     5 -0.584084588
66  1955     6 -0.622941360
67  1955     7  0.415489437
68  1955     8  0.795284404
69  1955     9  1.466845402
70  1955    10  1.141628527
71  1955    11  0.765529130
72  1955    12 -1.023021647
73  1956     1 -1.124766375
74  1956     2 -0.474553690
75  1956     3 -0.268739616
76  1956     4 -0.946112293
77  1956     5 -0.649648996
78  1956     6 -1.091469926
79  1956     7  0.461939136
80  1956     8  0.664178210
81  1956     9  0.725977919
82  1956    10 -0.856753197
83  1956    11 -1.263719269
84  1956    12 -0.177368335
85  1957     1  0.316675565
86  1957     2  0.027993723
87  1957     3 -0.174044569
88  1957     4  1.520179140
89  1957     5  2.422611749
90  1957     6  2.318278053
91  1957     7  1.398604261
92  1957     8 -0.206845197
93  1957     9 -0.295242566
94  1957    10  0.838050523
95  1957    11  0.496023289
96  1957    12  0.674610064
97  1958     1 -0.833405558
98  1958     2  0.178972529
99  1958     3  0.789580188
100 1958     4  0.498042030
101 1958     5  0.958867574
102 1958     6  0.817994629
103 1958     7  1.317115565
104 1958     8  0.548052031
105 1958     9  0.791395862
106 1958    10 -0.202348183
107 1958    11 -0.185472374
108 1958    12 -0.573237070
109 1959     1  0.748772633
110 1959     2  1.589380335
111 1959     3  2.245519551
112 1959     4  1.282335827
113 1959     5  0.908774069
114 1959     6 -0.230985967
115 1959     7 -0.578153162
116 1959     8 -2.173738514
117 1959     9 -0.781979204
118 1959    10  0.591462945
119 1959    11  1.209044771
120 1959    12  0.637837783
121 1960     1 -0.611659304
122 1960     2  1.142966581
123 1960     3  0.875938284
124 1960     4  1.055206992
125 1960     5  0.198141561
126 1960     6 -0.073011899
127 1960     7 -0.782718282
128 1960     8 -1.723451265
129 1960     9 -1.644828608
130 1960    10 -0.296360684
131 1960    11  0.357099850
132 1960    12  1.510177056
133 1961     1  0.175250932
134 1961     2  0.682083268
135 1961     3  0.813320992
136 1961     4  0.511228980
137 1961     5  0.965975133
138 1961     6  0.286599851
139 1961     7  0.407696405
140 1961     8 -0.456542926
141 1961     9  1.256788178
142 1961    10  1.473921977
143 1961    11  2.075065652
144 1961    12 -0.313256771
145 1962     1  0.691405802
146 1962     2  1.133514402
147 1962     3  0.535328607
148 1962     4 -0.675594245
149 1962     5 -1.625605770
150 1962     6 -1.128611718
151 1962     7 -1.585068702
152 1962     8 -1.316559667
153 1962     9 -2.226074735
154 1962    10 -2.448734783
155 1962    11 -2.137411297
156 1962    12 -1.723041291
157 1963     1 -0.432135354
158 1963     2 -0.830772565
159 1963     3  0.026904725
160 1963     4 -1.734899179
161 1963     5 -1.893427221
162 1963     6 -0.644307132
163 1963     7 -0.467980297
164 1963     8  0.747113476
165 1963     9 -0.001926101
166 1963    10  0.370884437
167 1963    11 -0.739003694
168 1963    12 -1.155681234
169 1964     1 -0.927157908
170 1964     2  0.203492391
171 1964     3  0.343926548
172 1964     4  0.125433073
173 1964     5 -0.051032247
174 1964     6 -0.487263929
175 1964     7 -0.859333471
176 1964     8 -1.891144836
177 1964     9 -1.988395533
178 1964    10 -2.185818707
179 1964    11 -1.337111350
180 1964    12 -0.909317534
181 1965     1  0.411413409
182 1965     2  1.124039431
183 1965     3  0.990751888
184 1965     4  0.015709428
185 1965     5 -0.594919147
186 1965     6  0.574351274
187 1965     7  2.167042418
188 1965     8  2.273373218
189 1965     9  2.042713936
190 1965    10  0.375954412
191 1965    11  0.399335079
192 1965    12 -1.062083995
193 1966     1 -0.975240957
194 1966     2  0.551819570
195 1966     3 -0.433154508
196 1966     4 -0.341979199
197 1966     5 -1.901994972
198 1966     6 -1.288391573
199 1966     7 -1.663312079
200 1966     8 -0.158270621
201 1966     9 -0.035815446
202 1966    10  0.416225863
203 1966    11 -0.347356026
204 1966    12 -0.921705035
205 1967     1 -0.757581786
206 1967     2 -0.340747223
207 1967     3 -0.300942234
208 1967     4  1.066832217
209 1967     5  1.568316098
210 1967     6  2.547144836
211 1967     7  2.256680906
212 1967     8  1.464774616
213 1967     9  0.166903377
214 1967    10 -0.522640567
215 1967    11 -0.087377079
216 1967    12  0.696492315
217 1968     1  0.710624512
218 1968     2  0.766405931
219 1968     3 -0.215784360
220 1968     4  0.343370401
221 1968     5 -0.660708618
222 1968     6 -1.042626110
223 1968     7 -1.841971308
224 1968     8 -0.226488520
225 1968     9  0.064772689
226 1968    10  0.262487913
227 1968    11 -0.699396554
228 1968    12 -0.343225069
229 1969     1 -0.669154750
230 1969     2 -0.796433432
231 1969     3 -0.666923448
232 1969     4 -0.509158158
233 1969     5  1.260902897
234 1969     6  1.730740750
235 1969     7  1.766182002
236 1969     8  0.325148919
237 1969     9 -0.026093273
238 1969    10  1.466516377
239 1969    11  2.116850037
240 1969    12  1.881201234
241 1970     1 -1.229280305
242 1970     2 -2.366982824
243 1970     3 -0.987584451
244 1970     4 -1.004888935
245 1970     5 -1.271603707
246 1970     6 -0.082112016
247 1970     7  0.129230456
248 1970     8  0.508522247
249 1970     9  0.166903377
250 1970    10  0.272974284
251 1970    11  1.128817488
252 1970    12 -0.158462352
253 1971     1 -0.339713274
254 1971     2 -0.614862566
255 1971     3 -0.715927850
256 1971     4 -0.158788167
257 1971     5 -0.716593397
258 1971     6 -1.073063974
259 1971     7 -1.677772390
260 1971     8 -1.496081410
261 1971     9  0.265963613
262 1971    10  0.401183662
263 1971    11  0.441085818
264 1971    12 -1.812012735
265 1972     1 -1.761182293
266 1972     2 -0.900787841
267 1972     3 -1.198912012
268 1972     4  0.660036410
269 1972     5 -0.364534950
270 1972     6  0.551129258
271 1972     7 -0.864875158
272 1972     8  0.602694275
273 1972     9  0.484952436
274 1972    10  1.064002347
275 1972    11  1.151900679
276 1972    12  0.703756690
277 1973     1  1.661344875
278 1973     2  0.617538680
279 1973     3  0.805423353
280 1973     4  1.359301340
281 1973     5  1.879694019
282 1973     6  1.277448152
283 1973     7  0.744642579
284 1973     8 -0.440655252
285 1973     9  0.948152140
286 1973    10  0.624471458
287 1973    11  0.896525549
288 1973    12  1.323743837
289 1974     1  2.364235445
290 1974     2  2.707915014
291 1974     3  0.757699936
292 1974     4  0.634522755
293 1974     5 -0.825596966
294 1974     6 -0.617621096
295 1974     7 -0.676256636
296 1974     8 -0.158270621
297 1974     9 -0.437020398
298 1974    10 -0.347881292
299 1974    11  0.623321699
300 1974    12  0.570667387
301 1975     1 -0.405442213
302 1975     2 -1.201110090
303 1975     3 -0.559503660
304 1975     4 -0.648785311
305 1975     5 -0.064878514
306 1975     6  0.185943167
307 1975     7  0.730227498
308 1975     8  0.831931953
309 1975     9  0.318780381
310 1975    10 -0.536583566
311 1975    11 -0.356114787
312 1975    12  0.271734300
313 1976     1  0.672088968
314 1976     2 -0.647007013
315 1976     3 -0.247451558
316 1976     4 -0.269198410
317 1976     5 -0.660708618
318 1976     6 -1.268768732
319 1976     7 -0.745068134
320 1976     8  0.261893402
321 1976     9  0.980894761
322 1976    10  0.942173309
323 1976    11  0.212630338
324 1976    12 -0.971860496
325 1977     1 -2.066781642
326 1977     2 -1.888315782
327 1977     3 -0.703600936
328 1977     4  0.103721147
329 1977     5 -0.796539942
330 1977     6 -1.109985285
331 1977     7 -0.713132742
332 1977     8  0.069550656
333 1977     9 -0.119768377
334 1977    10 -1.321991460
335 1977    11 -1.740001905
336 1977    12 -1.399243126
337 1978     1 -1.510626152
338 1978     2 -1.942465434
339 1978     3 -0.778344769
340 1978     4 -0.261200633
341 1978     5  0.460234330
342 1978     6  0.352327879
343 1978     7 -0.299624699
344 1978     8 -1.749141000
345 1978     9 -2.657441470
346 1978    10 -1.135052993
347 1978    11 -0.729051163
348 1978    12  0.368993686
349 1979     1 -0.300940895
350 1979     2 -0.089998891
351 1979     3 -0.311749749
352 1979     4 -0.325679405
353 1979     5  0.395334653
354 1979     6  0.696060682
355 1979     7  0.368506752
356 1979     8  1.551291141
357 1979     9  1.098569191
358 1979    10  1.773001661
359 1979    11  0.335796144
360 1979    12  1.236610651
361 1980     1  1.395097878
362 1980     2  0.595765508
363 1980     3 -0.072011175
364 1980     4  0.451563440
365 1980     5  0.488292851
366 1980     6 -0.118747581
367 1980     7 -0.037197609
368 1980     8 -0.082081945
369 1980     9  0.400749358
370 1980    10 -0.650963292
371 1980    11 -1.438340589
372 1980    12 -1.793919884
373 1981     1 -1.211572122
374 1981     2 -1.519571909
375 1981     3  0.543800147
376 1981     4  0.096458342
377 1981     5  0.728514514
378 1981     6 -0.100382516
379 1981     7 -0.243714838
380 1981     8 -1.196597119
381 1981     9 -1.113102453
382 1981    10 -0.710164388
383 1981    11 -1.227782600
384 1981    12 -0.445453511
385 1982     1 -0.654674861
386 1982     2 -0.865552505
387 1982     3 -2.546604111
388 1982     4 -3.554355212
389 1982     5 -0.633131307
390 1982     6  0.198664915
391 1982     7  0.340848049
392 1982     8 -0.241302749
393 1982     9 -0.448225369
394 1982    10  0.355625678
395 1982    11  0.378278899
396 1982    12  1.433039669
397 1983     1  1.058695994
398 1983     2  1.018267526
399 1983     3  1.879089726
400 1983     4  1.915462372
401 1983     5  1.800805114
402 1983     6  1.069186450
403 1983     7  0.847724566
404 1983     8  0.456489945
405 1983     9 -0.487798438
406 1983    10 -0.921241696
407 1983    11  0.227342595
408 1983    12  1.009821581
409 1984     1  1.459240612
410 1984     2 -0.036998282
411 1984     3 -0.132841877
412 1984     4  0.634522755
413 1984     5 -0.493431194
414 1984     6 -0.628270062
415 1984     7 -0.887136651
416 1984     8  0.713404483
417 1984     9  0.635524410
418 1984    10  1.651106019
419 1984    11  0.933158588
420 1984    12  1.360507988
421 1985     1 -0.640266236
422 1985     2  0.104329787
423 1985     3 -0.366350845
424 1985     4  0.281265076
425 1985     5 -0.304408199
426 1985     6 -0.100382516
427 1985     7  0.276911112
428 1985     8  0.266145478
429 1985     9  0.844396050
430 1985    10 -0.006266670
431 1985    11  0.987477957
432 1985    12  0.255247100
433 1986     1  0.197378568
434 1986     2 -0.157577899
435 1986     3 -1.198912012
436 1986     4  0.125433073
437 1986     5 -0.462030838
438 1986     6 -0.307850054
439 1986     7 -0.864875158
440 1986     8 -0.811496513
441 1986     9 -0.945567082
442 1986    10 -0.387188469
443 1986    11  0.335796144
444 1986    12  0.681919081
445 1987     1  0.186332074
446 1987     2  0.660695594
447 1987     3  0.813320992
448 1987     4  0.059950835
449 1987     5  0.717215994
450 1987     6  1.336162448
451 1987     7  1.146394183
452 1987     8  0.594937225
453 1987     9 -0.448225369
454 1987    10  0.299037285
455 1987    11  0.516415357
456 1987    12  1.336036276
457 1988     1  1.362658872
458 1988     2  0.755970672
459 1988     3 -0.032085243
460 1988     4 -0.803518366
461 1988     5  0.395334653
462 1988     6  0.244967121
463 1988     7  0.744642579
464 1988     8  0.201823753
465 1988     9  0.274824464
466 1988    10 -0.367461864
467 1988    11 -1.387224147
468 1988    12 -0.776805208
469 1989     1  0.777135449
470 1989     2  1.282109750
471 1989     3  0.046347883
472 1989     4 -1.105234013
473 1989     5  0.053329938
474 1989     6  0.519962191
475 1989     7  0.664746936
476 1989     8  0.051530467
477 1989     9  0.069484885
478 1989    10  0.139273473
479 1989    11 -0.278165482
480 1989    12 -0.551528232
481 1990     1 -0.249989505
482 1990     2  0.540748306
483 1990     3  1.632942998
484 1990     4  0.785413519
485 1990     5  0.154841408
486 1990     6 -1.621511006
487 1990     7 -0.243714838
488 1990     8  0.387308848
489 1990     9  1.088021207
490 1990    10  0.553329129
491 1990    11  0.656113329
492 1990    12  0.213669004
493 1991     1  0.442450102
494 1991     2 -0.796433432
495 1991     3 -0.790988560
496 1991     4 -0.578281546
497 1991     5 -0.064878514
498 1991     6  0.400931436
499 1991     7  1.093566073
500 1991     8  1.832718842
501 1991     9  1.614456415
502 1991    10  0.886161290
503 1991    11  0.902654840
504 1991    12  0.949249804
505 1992     1  1.919621551
506 1992     2 -0.240723956
507 1992     3  1.879089726
508 1992     4  0.438189881
509 1992     5 -0.051032247
510 1992     6 -0.994530169
511 1992     7 -0.202355050
512 1992     8  0.717164727
513 1992     9  0.116236184
514 1992    10 -0.328444131
515 1992    11 -0.769068406
516 1992    12  0.271734300

precintcon documentation built on May 2, 2019, 3:07 p.m.