library(forecast)
## Warning: package 'forecast' was built under R version 4.2.2
## Registered S3 method overwritten by 'quantmod':
##   method            from
##   as.zoo.data.frame zoo
library(tseries)
## Warning: package 'tseries' was built under R version 4.2.2
rainfall <- c(799,1174.8,865.1,1334.6,635.4,918.5,685.5,998.6,784.2,985,882.8,1071)
x <- ts(rainfall,start = c(2012,1),frequency = 12)
plot(x)

tseries::adf.test(x) 
## 
##  Augmented Dickey-Fuller Test
## 
## data:  x
## Dickey-Fuller = -1.5247, Lag order = 2, p-value = 0.7535
## alternative hypothesis: stationary
dx <- diff(x)
plot(dx)

tseries::adf.test(dx)
## Warning in tseries::adf.test(dx): p-value smaller than printed p-value
## 
##  Augmented Dickey-Fuller Test
## 
## data:  dx
## Dickey-Fuller = -8.9033, Lag order = 2, p-value = 0.01
## alternative hypothesis: stationary
summary(cars)
##      speed           dist       
##  Min.   : 4.0   Min.   :  2.00  
##  1st Qu.:12.0   1st Qu.: 26.00  
##  Median :15.0   Median : 36.00  
##  Mean   :15.4   Mean   : 42.98  
##  3rd Qu.:19.0   3rd Qu.: 56.00  
##  Max.   :25.0   Max.   :120.00

#Conclusion Se realizaron dos ejecuciones, ya que la primera no mostró estacionaridad. La segunda ejecución tiene estacionaridad debido al P-value de 0.01.

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