-----Original Message-----
From: R-sig-meta-analysis <r-sig-meta-analysis-bounces at r-project.org> On Behalf
Of ?????? via R-sig-meta-analysis
Sent: Monday, December 11, 2023 08:38
To: r-sig-meta-analysis at r-project.org
Cc: ?????? <t571 at wlgsh.tp.edu.tw>
Subject: [R-meta] About meta-regression analysis
Hello all,
As I read through the "Doing meta in R" website and to the part of
meta-regression, this is the example that the website provides in order to
change the categorical moderators into numerical ones (since you need
"numbers" to begin to test the interaction between moderators):
--------------------------------------------------------------------
# Add factor labels to 'continent'
# 0 = Europe
# 1 = North America
levels(MVRegressionData$continent) = c("Europe", "North America")
--------------------------------------------------------------------
and I thought of my own data. I have a moderator in my data named "Duration
of treatment," with "Short", "Medium", "Long" and "N/A"(some of the studies
didn't provide the duration of treatment). In this case, how would I code
in order to change this moderator into numerical order to begin the
meta-regression analysis?
Nick
??? (Nick Chen)
Email: t571 at wlgsh.tp.edu.tw <t5741 at wlgsh.tp.edu.tw>