Description Usage Arguments Value Author(s) See Also Examples
Calculates the Standardized Precipitation Index (SPI) per year on a daily or monthly precipitation serie.
1 | spi.per.year(object, period = 3, distribution = "Gamma", FUN = mean)
|
object |
a daily or monthly precipitation serie. |
period |
the number of months to be aggregate in the calculation of the standardized precipitation index. (Default value: 3) |
distribution |
(it has no effect yet). |
FUN |
the function used to summarize the standardized precipitation index per year. (Default function: mean). |
A data.frame (precintcon.spi.per.year) containing the following variables:
year
is the year.
spi
is the standardized precipitation index.
Lucas Venezian Povoa lucasvenez@gmail.com
1 2 3 4 5 6 7 | ##
# Loading the monthly precipitation serie.
data(monthly)
##
# Performing the Standardized Precipitation Index
spi.per.year(monthly, period = 3)
|
Loading required package: ggplot2
Loading required package: scales
Attaching package: 'precintcon'
The following object is masked from 'package:ggplot2':
stat
year spi.FUN
1 1950 -0.3179992148
2 1951 0.6273567697
3 1952 -0.2017762673
4 1953 -0.1238411014
5 1954 -1.2765934267
6 1955 0.0901489810
7 1956 -0.4167530359
8 1957 0.7780745028
9 1958 0.3421297686
10 1959 0.4540225889
11 1960 0.0006250237
12 1961 0.6565109727
13 1962 -1.0422044499
14 1963 -0.5629358449
15 1964 -0.8303102920
16 1965 0.7264734459
17 1966 -0.5915979152
18 1967 0.6464879565
19 1968 -0.2402115912
20 1969 0.6566482629
21 1970 -0.4078722281
22 1971 -0.6247152225
23 1972 0.0106816536
24 1973 0.9748025607
25 1974 0.3829762691
26 1975 -0.1194834035
27 1976 -0.1450318484
28 1977 -0.9738407828
29 1978 -0.8234493681
30 1979 0.5355668280
31 1980 -0.0718160868
32 1981 -0.5332973712
33 1982 -0.5197824087
34 1983 0.8228204778
35 1984 0.4340655657
36 1985 0.1331748413
37 1986 -0.3162475965
38 1987 0.6015227412
39 1988 0.0510939405
40 1989 0.1390827705
41 1990 0.3247643665
42 1991 0.4909672291
43 1992 0.2296568674
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