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## Function to check if x is of good dimension
f.error.multivariate = function(x){
if (!is.vector(x) && dim(x)[2] != 1) {
stop("this function only handle univariate time-series")
}
}
## Function to convert nse type into sandwich type
f.type.sandwich = function(type.in) {
type.in = type.in[1]
if (type.in == "bartlett") {
type.out = "Bartlett"
} else if (type.in == "parzen") {
type.out = "Parzen"
} else if (type.in == "tukey") {
type.out = "Tukey-Hanning"
} else if (type.in == "qs") {
type.out = "Quadratic Spectral"
} else if (type.in == "trunc") {
type.out = "Truncated"
} else {
stop("Invalid type : must be one of c('bartlett', 'parzen', 'tukey', 'qs', 'trunc')")
}
return(type.out)
}
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