concurve (version 2.7.7)

curve_meta: Consonance Functions For Meta-Analytic Data

Description

Computes thousands of consonance (confidence) intervals for the chosen parameter in the meta-analysis done by the metafor package and places the interval limits for each interval level into a data frame along with the corresponding p-values and s-values.

Usage

curve_meta(x, measure = "default", method = "uni", parm = NULL,
  robust = FALSE, cluster = NULL, adjust = FALSE, steps = 1000,
  cores = getOption("mc.cores", 1L), table = TRUE)

Arguments

x

Object where the meta-analysis parameters are stored, typically a list produced by 'metafor'

measure

Indicates whether the object has a log transformation or is normal/default. The default setting is "default. If the measure is set to "ratio", it will take logarithmically transformed values and convert them back to normal values in the dataframe. This is typically a setting used for binary outcomes such as risk ratios, hazard ratios, and odds ratios.

method

Indicates which meta-analysis metafor function is being used. Currently supports rma.uni ("uni"), which is the default, rma.mh ("mh"), and rma.peto ("peto")

parm

Typically ignored, but needed sometimes in order to specify which variable to produce function for.

robust

a logical indicating whether to produce cluster robust interval estimates Default is FALSE.

cluster

a vector specifying a clustering variable to use for constructing the sandwich estimator of the variance-covariance matrix. Default setting is NULL.

adjust

logical indicating whether a small-sample correction should be applied to the variance-covariance matrix. Default is FALSE.

steps

Indicates how many consonance intervals are to be calculated at various levels. For example, setting this to 100 will produce 100 consonance intervals from 0 to 100. Setting this to 10000 will produce more consonance levels. By default, it is set to 1000. Increasing the number substantially is not recommended as it will take longer to produce all the intervals and store them into a dataframe

cores

Select the number of cores to use in order to compute the intervals The default is 1 core.

table

Indicates whether or not a table output with some relevant statistics should be generated. The default is TRUE and generates a table which is included in the list object.

Value

A list with 3 items where the dataframe of values is in the first object, the values needed to calculate the density function in the second, and the table for the values in the third if table = TRUE.

Examples

# NOT RUN {
# Simulate random data for two groups in two studies
GroupAData <- runif(20, min = 0, max = 100)
GroupAMean <- round(mean(GroupAData), digits = 2)
GroupASD <- round(sd(GroupAData), digits = 2)

GroupBData <- runif(20, min = 0, max = 100)
GroupBMean <- round(mean(GroupBData), digits = 2)
GroupBSD <- round(sd(GroupBData), digits = 2)

GroupCData <- runif(20, min = 0, max = 100)
GroupCMean <- round(mean(GroupCData), digits = 2)
GroupCSD <- round(sd(GroupCData), digits = 2)

GroupDData <- runif(20, min = 0, max = 100)
GroupDMean <- round(mean(GroupDData), digits = 2)
GroupDSD <- round(sd(GroupDData), digits = 2)

# Combine the data

StudyName <- c("Study1", "Study2")
MeanTreatment <- c(GroupAMean, GroupCMean)
MeanControl <- c(GroupBMean, GroupDMean)
SDTreatment <- c(GroupASD, GroupCSD)
SDControl <- c(GroupBSD, GroupDSD)
NTreatment <- c(20, 20)
NControl <- c(20, 20)

metadf <- data.frame(
  StudyName, MeanTreatment, MeanControl,
  SDTreatment, SDControl, NTreatment, NControl
)

# Use metafor to calculate the standardized mean difference

library(metafor)

dat <- escalc(
  measure = "SMD", m1i = MeanTreatment, sd1i = SDTreatment,
  n1i = NTreatment, m2i = MeanControl, sd2i = SDControl,
  n2i = NControl, data = metadf
)

# Pool the data using a particular method. Here "FE" is the fixed-effects model

res <- rma(yi, vi,
  data = dat, slab = paste(StudyName, sep = ", "),
  method = "FE", digits = 2
)

# Calculate the intervals using the metainterval function

metaf <- curve_meta(res)
# }