SNHTabsolute2SDs: standard normal homogeneity test (SNHT) absolute homogeneity...
In climtrends: Statistical Methods for Climate Sciences

Description Usage Arguments Value Author(s) Source References Examples

SNHTabsolute2SDs returns the result of the standard normal homogeneity test (SNHT) absolute homogeneity test for two different SDs applied to a time series.

1	SNHTabsolute2SDs(dataSeries)

dataSeries

time series of climate data

The result of the SNHT absolute homogeneity test for two different SDs.

Jose Gama

ALEXANDERSSON, H. and MOBERG, A. (1997), HOMOGENIZATION OF SWEDISH TEMPERATURE DATA. PART I: HOMOGENEITY TEST FOR LINEAR TRENDS. Int. J. Climatol., 17: 25<e2><80><93>34. doi: 10.1002/(SICI)1097-0088(199701)17:1<25::AID-JOC103>3.0.CO;2-J

Tuomenvirta, H., 2002: Homogeneity testing and adjustment of climatic time series in Finland. Geophysica, 38(1-2), 15-41.

# standard normal homogeneity test (SNHT) for Turin 1961-2003
testTurin<- SNHTabsolute2SDs(yearly.average.temperature.Turin.Milan[,2])

# standard normal homogeneity test (SNHT) for Milan 1961-2003
testMilan<- SNHTabsolute2SDs(yearly.average.temperature.Turin.Milan[,3])

plot(1961:2000,testTurin,type='l',col='cyan',ylim=c(0,30),
main='standard normal homogeneity test (SNHT) 2 SDs 1961-2003',xlab='Years',ylab='test value')
par(new=TRUE)
plot(1961:2000,testMilan,type='l',col='magenta',ylim=c(0,30),xlab='',ylab='')
legend("top",c('Turin','Milan'),text.col=c('cyan','magenta'))