[R-meta] formula for calculating MCS (mean change score)

[Gerta Ruecker]

Dear Homa,

First of all, your questions seem very basic to me, if understand them 
correctly. Otherwise, please correct me.

Secondly, what is mean change score? It is what the name says. You have 
one or more groups of individuals and from (ideally) everyone you have a 
pre- (or baseline) value x_{0i} and a post value x_{1i}. The change 
score is the difference, for example post minus pre:

d_i = x_{1i} - x_{0i}

The mean change score within a group is the mean of the d_i within this 
group. You may then compare these means between groups with different 
treatments etc.

The calculation both in Excel and R is thus very simple - you must have 
the x_{1i} and x_{0i} in different columns (rows are individuals) and 
then build the difference.

Finally, please note that this is an R list, not an Excel forum and also 
not a SAS or SPSS forum.

Best,

Gerta

Am 14.04.2021 um 16:17 schrieb Homa Keshavarz:
> Hello,
>
> I appreciate it  if you send me a formula for calculating MCS, what is the syntax in SAS, SPSS please.
>
> Have you come to any publication used MCS?
>
>    Can we calculate it  in excel file?
>
> Many thanks in advance,
> Homa
>
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-- 

Dr. rer. nat. Gerta Rücker, Dipl.-Math.

Institute of Medical Biometry and Statistics,
Faculty of Medicine and Medical Center - University of Freiburg

Stefan-Meier-Str. 26, D-79104 Freiburg, Germany

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