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2018_Loram_CC_IRT.R
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2018_Loram_CC_IRT.R
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# Specify packages
# devtools::install_github("Lngtax/misinformation")
library(misinformation)
library(psych)
library(ltm)
library(tidyverse)
library(here)
library(corrr)
library(dplyr)
library(ggpubr)
library(GPArotation)
library(tableone)
library(apaTables)
library(MBESS)
# Data validatation and filtration ----------------------------------------
# The following commented code has been pre-run to clean and verify the data.
# This code removes some variables inrelated to this scale.
#
# # Specify data location
# data <- here("data", "2018measures_data.csv")
#
# dat <- read_qualtrics(data)
#
# # Stitch metadata names
# meta <- read_csv(here("data", "2018measures_metadata.csv")) %>%
# janitor::clean_names() %>%
# mutate(variable_id = tolower(variable_id),
# variable_label = tolower(variable_label),
# reverse = as.logical(reverse))
#
# dat <- dat %>% rename_at(meta$variable_id, ~ meta$variable_label)
#
# # Remove irrelevant columns
#
# dat <- select(dat, -x123, -x124,
# -end_date, -status, -progress, -duration_seconds, -finished,
# -recorded_date, -response_id, -distribution_channel,
# -user_language, -vax01, -vax02, -vax03, -vax04, -vax05, -vax06,
# -vax07, -vax08, -vax09, -vax10, -vax11, -vax12, -vax13, -vax14,
# -vax15, -vax16, -vax17, -vax18, -vax19, -vax20, -vax21, -vax22,
# -vax23, -vax24, -vax25, -vax26, -vax27, -psm01, -psm02, -psm03,
# -psm04, -psm05)
#
# write_csv(dat, here("data", "2018_Loramdata.csv"))
# Project initiation ------------------------------------------------------
dat <- read_csv(here("data", "2018_Loramdata.csv"))
# data cleaning # fix ages --------------------------------
dat <- dat %>%
mutate(age = case_when(
age == 1994 ~ 24,
age == 1981 ~ 37,
TRUE ~ as.numeric(age)
))
dat <- dat %>%
mutate(
# Convergent measures totals
# trust in science
trust_tot = trust01 + trust02 +trust03 + trust04 + trust05 + trust06 + trust07 + trust08 + trust09 + trust10 + trust11 +
trust12 + trust13 + trust14,
# ASC, reverse code items: 3, 5, 6, 7, 10, 11, 15, 16, 17
asc03 = 8 - asc03,
asc05 = 8 - asc05,
asc06 = 8 - asc06,
asc07 = 8 - asc07,
asc10 = 8 - asc10,
asc11 = 8 - asc11,
asc15 = 8 - asc15,
asc16 = 8 - asc16,
asc17 = 8 - asc17,
asc_tot = asc01 + asc02 + asc03 + asc04 + asc05 + asc06 + asc07 + asc08 + asc09 + asc10 + asc11 + asc12 +
asc13 + asc14 + asc15 + asc16 + asc17+ asc18,
#reverse code and total SDO scores
sdo03 = 8 - sdo03,
sdo04 = 8 - sdo04,
sdo07 = 8 - sdo07,
sdo08 = 8 - sdo08,
sdo_tot = sdo01 + sdo02 + sdo03 + sdo04 + sdo05 + sdo06 + sdo07 + sdo08,
# conspiracy total
cons_tot = cons01 + cons02 + cons03 + cons04 + cons05 + cons06 + cons07 +
cons08 + cons09 + cons10 + cons11 + cons12 + cons13 + cons14 + cons15,
# Recode CCD items, accounting for reversed items 5, 10, 11, 14, 15
ccd01 = 3 - ccd01,
ccd02 = 3 - ccd02,
ccd03 = 3 - ccd03,
ccd04 = 3 - ccd04,
ccd06 = 3 - ccd06,
ccd07 = 3 - ccd07,
ccd08 = 3 - ccd08,
ccd09 = 3 - ccd09,
ccd12 = 3 - ccd12,
ccd13 = 3 - ccd13,
ccd16 = 3 - ccd16,
ccd17 = 3 - ccd17,
ccd18 = 3 - ccd18
)
# IRT Model -----------------
# makes a new object containing only denial items, and minuses 1 from them all
ccd <- dat %>%
dplyr::select(starts_with("ccd")) %>%
mutate_all(funs(.-1))
out <- ltm(ccd~z1)
# Plot model
plot(out)
IRTplot(out)
# Spreads out the x axis
IRTplot(out) + coord_cartesian(xlim = c(-1.5, 3))
out
# Refinining CCD measure
ccdrefined02 <- dat %>%
dplyr::select("ccd05", "ccd18", "ccd11", "ccd13", "ccd08", "ccd06", "ccd09", "ccd16") %>%
mutate_all(funs(.-1))
out_refined02 <- ltm(ccdrefined02~z1)
plot(out_refined02)
IRTplot(out_refined02)
# Spreads out the x axis
IRTplot(out_refined02) + coord_cartesian(xlim = c(-.8, 3))
# Estimate participant scores -----------------------
o2 <- factor.scores.ltm(object = out_refined02, resp.patterns = ccdrefined02)
fscores2 <- o2$score.dat[, "z1"]
fscores2
describe(fscores2)
# Add the scores into a column in the dataframe
dat <- dat %>%
mutate(ccd2 = fscores2)
# correlations of convergent measures -------------
datcorCI <- select(dat, "trust_tot", "sdo_tot", "ccd2", "asc_tot", "cons_tot") %>%
apa.cor.table()
cor.test(dat$cons_tot, dat$ccd2)
# Reliability Of convergent measures -----
trust <- dat[c("trust01",
"trust02",
"trust03",
"trust04",
"trust05",
"trust06",
"trust07",
"trust08",
"trust09",
"trust10",
"trust11",
"trust12",
"trust13",
"trust14")]
ci.reliability(data=trust, type="omega", conf.level = 0.95,interval.type="bca", B=1000)
asc <- dat[c("asc01",
"asc02",
"asc03",
"asc04",
"asc05",
"asc06",
"asc07",
"asc08",
"asc09",
"asc10",
"asc11",
"asc12",
"asc13",
"asc14",
"asc15",
"asc16",
"asc17",
"asc18")]
ci.reliability(data=asc, type="omega", conf.level = 0.95,interval.type="bca", B=1000)
sdo <- dat[c("sdo01",
"sdo02",
"sdo03",
"sdo04",
"sdo05",
"sdo06",
"sdo07",
"sdo08")]
ci.reliability(data=sdo, type="omega", conf.level = 0.95,interval.type="bca", B=1000)
cons <- dat[c("cons01",
"cons02",
"cons03",
"cons04",
"cons05",
"cons06",
"cons07",
"cons08",
"cons09",
"cons10",
"cons11",
"cons12",
"cons13",
"cons14",
"cons15")]
ci.reliability(data=cons, type="omega", conf.level = 0.95,interval.type="bca", B=1000)
# of CCD Measure
ci.reliability(data=ccdrefined02, type="omega", conf.level = 0.95,interval.type="bca", B=1000)
# Creating tables --------------------------
tableonevars <- select(dat, age, gender, location, education, trust_tot, asc_tot, sdo_tot, cons_tot)
catvars <- select(tableonevars, gender, education)
catvars1 <- c("gender", "education")
tab2 <- CreateTableOne(data = tableonevars, factorVars = catvars)
tab2
tab3 <- CreateTableOne(strata = "trt" , data = tableonevars, factorVars = catvars)
tableonevarsnames <- c("age", "gender", "location", "education", "trust_tot", "asc_tot", "sdo_tot", "cons_tot")
tab4 <- CreateTableOne(vars = tableonevarsnames, data = dat, factorVars = catvars1)
print(tab4)
print(tab4, quote = TRUE, noSpaces = TRUE)