[R] Meta-analysis with zero values for mean and sd. Continuous data.

[aletheia]

Hi!
I want to do a meta-analysis with count data for treatement/control cases.
Mi problem is that I need to use zero values (an informative value) for the
mean and standard deviation for one of the treatement, but R has a problem:
"Studies with zero values for sd.e or sd.c get no weight in meta-analysis".
I can agroup the case by Family (byvar=Family).
¿anybody help me? Thanks!


> datos<-read.table(file="datos_totales.csv",head=TRUE,sep=",",dec=",") 
> datos[10:20,]
            Study ControlN ControlMean ControlSD TreatedN TreatedMean
TreatedSD       Family
10 Ali.Gmb.S1.Inv        3    893.3333 180.36999        3  1213.33333
410.52812 Capitellidae
11 Ali.Gmb.S2.Inv        3    640.0000 348.71192        3   666.66667
220.30282 Capitellidae
12 Ali.Gmb.S3.Inv        3    426.6667 184.75209        3   920.00000
628.64935 Capitellidae
13 Ali.Cul.S1.Ver        3    213.3333 115.47005        3     0.00000  
0.00000 Cirratulidae
14 Ali.Cul.S2.Ver        3    160.0000 144.22205        3    40.00000 
40.00000 Cirratulidae
15 Ali.Cul.S3.Ver        3    293.3333 234.37861        3    26.66667 
46.18802 Cirratulidae
16 Ali.Cul.S1.Inv        3    653.3333 532.66625        3    13.33333 
23.09401 Cirratulidae
17 Ali.Cul.S2.Inv        3    706.6667 335.45988        3    26.66667 
23.09401 Cirratulidae
18 Ali.Cul.S3.Inv        3    666.6667 674.48746        3    80.00000 
80.00000 Cirratulidae
19 Ali.Gmb.S1.Ver        3    280.0000  69.28203        3     0.00000  
0.00000 Cirratulidae
20 Ali.Gmb.S2.Ver        3    226.6667 220.30282        3     0.00000  
0.00000 Cirratulidae
 
>  library(meta)
  
> 
> metaanalisis2<-metacont(TreatedN,TreatedMean,TreatedSD,ControlN,ControlMean,ControlSD,data=datos,byvar=Family,label.c="Control",print.byvar=FALSE,label.e="Treatment",studlab=Study)
*Mensajes de aviso perdidos
In metacont(TreatedN, TreatedMean, TreatedSD, ControlN, ControlMean,  :
  Studies with zero values for sd.e or sd.c get no weight in meta-analysis*

--
View this message in context: http://r.789695.n4.nabble.com/Meta-analysis-with-zero-values-for-mean-and-sd-Continuous-data-tp3655977p3655977.html
Sent from the R help mailing list archive at Nabble.com.