get_loss_data {sentometrics}

Retrieve loss data from a selection of models

Description

Structures specific performance data for a set of different sento_modelIter objects as loss data. Can then be used, for instance, as an input to create a model confidence set (Hansen, Lunde and Nason, 2011) with the MCS package.

Usage

get_loss_data(models, loss = c("DA", "error", "errorSq", "AD", "accuracy"))

Arguments

models

a named list of sento_modelIter objects. All models should be of the same family, being either "gaussian", "binomial" or "multinomial", and have performance data of the same dimensions.

loss

a single character vector, either "DA" (directional inaccuracy), "error" (predicted minus realized response variable), "errorSq" (squared errors), "AD" (absolute errors) or "accuracy" (inaccurate class predictions). This argument defines on what basis the model confidence set is calculated. The first four options are available for "gaussian" models, the last option applies only to "binomial" and "multinomial" models.

Value

A matrix of loss data.

Author(s)

Samuel Borms

References

Hansen, Lunde and Nason (2011). The model confidence set. Econometrica 79, 453-497, doi: 10.3982/ECTA5771.

See Also

sento_model, MCSprocedure

Examples

## Not run: 
data("usnews", package = "sentometrics")
data("list_lexicons", package = "sentometrics")
data("list_valence_shifters", package = "sentometrics")
data("epu", package = "sentometrics")

set.seed(505)

# construct two sento_measures objects
corpusAll <- sento_corpus(corpusdf = usnews)
corpus <- quanteda::corpus_subset(corpusAll, date >= "1997-01-01" & date < "2014-10-01")
l <- sento_lexicons(list_lexicons[c("LM_en", "HENRY_en")], list_valence_shifters[["en"]])

ctrA <- ctr_agg(howWithin = "proportionalPol", howDocs = "proportional",
                howTime = c("equal_weight", "linear"), by = "month", lag = 3)
sentMeas <- sento_measures(corpus, l, ctrA)

# prepare y and other x variables
y <- epu[epu$date %in% get_dates(sentMeas), "index"]
length(y) == nobs(sentMeas) # TRUE
x <- data.frame(runif(length(y)), rnorm(length(y))) # two other (random) x variables
colnames(x) <- c("x1", "x2")

# estimate different type of regressions
ctrM <- ctr_model(model = "gaussian", type = "AIC", do.iter = TRUE,
                 h = 0, nSample = 120, start = 50)
out1 <- sento_model(sentMeas, y, x = x, ctr = ctrM)
out2 <- sento_model(sentMeas, y, x = NULL, ctr = ctrM)
out3 <- sento_model(subset(sentMeas, select = "linear"), y, x = x, ctr = ctrM)
out4 <- sento_model(subset(sentMeas, select = "linear"), y, x = NULL, ctr = ctrM)

lossData <- get_loss_data(models = list(m1 = out1, m2 = out2, m3 = out3, m4 = out4),
                          loss = "errorSq")

mcs <- MCS::MCSprocedure(lossData)
## End(Not run)