K Amoatwi
2020-Jun-23 15:29 UTC
[R] Error message in meta-analysis package Metafor-weights =""
Dear Wolfgang, Yes! The "metafor::forest(result.md)" works Thank you very much. Any reason why "forest(result.md)" was not working? Kobby On Tue, Jun 23, 2020 at 11:18 AM Viechtbauer, Wolfgang (SP) < wolfgang.viechtbauer at maastrichtuniversity.nl> wrote:> You have loaded the 'meta' package after 'metafor' and then forest() will > try to use the corresponding function from the meta package and not > metafor. With: > > metafor::forest(result.md) > > it should work. > > Best, > Wolfgang > > >-----Original Message----- > >From: K Amoatwi [mailto:amoatwik20 at gmail.com] > >Sent: Tuesday, 23 June, 2020 16:37 > >To: Viechtbauer, Wolfgang (SP) > >Cc: r-help at r-project.org > >Subject: Re: [R] Error message in meta-analysis package Metafor-weights > ="" > > > >Dear Wolfgang, > >I have posted the requested information you asked for. > > > >> sessionInfo() > >R version 4.0.1 (2020-06-06) > >Platform: x86_64-w64-mingw32/x64 (64-bit) > >Running under: Windows 10 x64 (build 18362) > > > >Matrix products: default > > > >locale: > >[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United > >States.1252 > >[3] LC_MONETARY=English_United States.1252 > >LC_NUMERIC=C > >[5] LC_TIME=English_United States.1252 > > > >attached base packages: > >[1] stats graphics grDevices utils datasets methods base > > > >other attached packages: > >[1] meta_4.12-0 reshape2_1.4.4 metafor_2.4-0 Matrix_1.2-18 > > > >loaded via a namespace (and not attached): > > [1] Rcpp_1.0.4.6 lattice_0.20-41 MASS_7.3- > >51.6 grid_4.0.1 > > [5] plyr_1.8.6 nlme_3.1- > >148 magrittr_1.5 stringi_1.4.6 > > [9] minqa_1.2.4 nloptr_1.2.2.1 boot_1.3- > >25 splines_4.0.1 > >[13] statmod_1.4.34 lme4_1.1- > >23 tools_4.0.1 stringr_1.4.0 > >[17] CompQuadForm_1.4.3 compiler_4.0.1 > >> > > > >> class(result.md) > >[1] "rma.uni" "rma" > >> > > > >Thank you > >Kobby > > > >On Tue, Jun 23, 2020 at 3:24 AM Viechtbauer, Wolfgang (SP) > ><wolfgang.viechtbauer at maastrichtuniversity.nl> wrote: > >Dear Kobby, > > > >Please post the output of sessionInfo() and class(result.md). > > > >Best, > >Wolfgang > > > >>-----Original Message----- > >>From: K Amoatwi [mailto:amoatwik20 at gmail.com] > >>Sent: Monday, 22 June, 2020 22:30 > >>To: Viechtbauer, Wolfgang (SP) > >>Cc: r-help at r-project.org > >>Subject: Re: [R] Error message in meta-analysis package Metafor-weights > ="" > >> > >>Hi Wolfgang and All, > >>I am still practising my meta-analysis with the "Metafor" package, I > tried > >>to run the code for "Forest plot" and got error message as shown below: > >>forest(result.md) > >>> forest(result.md) > >>Error in UseMethod("forest") : > >> no applicable method for 'forest' applied to an object of class > >>"c('rma.uni', 'rma')" > >> > >>Thank you in advance for your support > >> > >>regards > >>Kobby > >> > >>On Tue, Jun 16, 2020 at 12:50 PM Viechtbauer, Wolfgang (SP) > >><wolfgang.viechtbauer at maastrichtuniversity.nl> wrote: > >>Dear Amoatwi, > >> > >>This way of using the escalc() function has been deprecated. It might be > >>added back once there is actually any benefit from having this > >>functionality, but for years it just meant that I had to maintain two > >>different ways of doing the exact same thing without any additional > >>benefits. > >> > >>Best, > >>Wolfgang > >> > >>-- > >>Wolfgang Viechtbauer, Ph.D., Statistician | Department of Psychiatry and > >>Neuropsychology | Maastricht University | P.O. Box 616 (VIJV1) | 6200 MD > >>Maastricht, The Netherlands | +31 (43) 388-4170 | http://www.wvbauer.com > >> > >>>-----Original Message----- > >>>From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of K > Amoatwi > >>>Sent: Tuesday, 16 June, 2020 4:50 > >>>To: r-help at r-project.org > >>>Subject: [R] Error message in meta-analysis package Metafor-weights ="" > >>> > >>>Dear All, > >>>I am using the example from one of the tutorial about "Metafor" package > >and > >>>"escalc" function, to learn how this package can be applied to do > >>>meta-analysi; the code and the data is directly from the tutorials but > >>>"weights=freq" option in the escalc function is given me error message > >>>This is the code below: > >>> > >>>library(metafor) # Load package > >>>#####DATASET 1: BCG Vaccine Trials > >>>data(dat.bcg) # BCG meta-analytic dataset > >>> > >>>##Formula based Specification > >>>##That is, what if I have multiple rows per study, corresponding to > >>>difference treatment groups? > >>> > >>>library(reshape2) # Load package for data reshaping > >>> > >>>bcg.long <- melt(dat.bcg[, c("trial", "tpos", "tneg", "cpos", "cneg")], > id > >>>= "trial") > >>>bcg.long$pos <- ifelse(bcg.long$var == "tpos" | bcg.long$var == "cpos", > 1, > >>>0) > >>>bcg.long$group <- ifelse(bcg.long$var == "tpos" | bcg.long$var => "tneg", > >>>1, 0) > >>> > >>>##sample of the data, the first 6 rows > >>>head(bcg.long) > >>> trial variable value pos group > >>>1 1 tpos 4 1 1 > >>>2 2 tpos 6 1 1 > >>>3 3 tpos 3 1 1 > >>>4 4 tpos 62 1 1 > >>>5 5 tpos 33 1 1 > >>>6 6 tpos 180 1 1 > >>> > >>>##Now applying the " escalc " function > >>> > >>>escalc(factor(pos)~factor(group)| factor(trial),weights = value,data > >>>bcg.long, measure = "OR") > >>> > >>>##Then I got this error message > >>>Error in escalc(factor(pos) ~ factor(group) | factor(trial), weights > >>>value, : > >>> object 'value' not found > >>> > >>>I used the same data with different example from another author and got > a > >>>similar error message > >>>Second code with the same data but different coding > >>>Sample data > >>> > >>>with the first 6 rows of the rearranged data shown below. (T=treatment, > >>>C=Control group, Out=outcome whether positive or negative, and then > >>>frequency) > >>> study grp out freq > >>>1 1 T + 4 > >>>2 1 T - 119 > >>>3 1 C + 11 > >>>4 1 C - 128 > >>>5 2 T + 6 > >>>6 2 T - 300 > >>> > >>>>escalc(out ~ grp | study, weights = freq, data = dat.fm, measure > "OR") > >>> > >>>Error in escalc(out ~ grp | study, weights = freq, data = dat.fm, > measure > >> >>>"OR") : > >>> object 'freq' not found > >>> > >>>I am not sure what I am doing wrong since both authors were able to get > >>>their results while I am getting error messages. > >>> > >>>Any help will be very much appreciated > >>> > >>>Amoatwi >[[alternative HTML version deleted]]
Michael Dewey
2020-Jun-23 15:39 UTC
[R] Error message in meta-analysis package Metafor-weights =""
The two packages both define a function forest. When you load the second package R will have told you that it was masking the definition of forest from the first package. If you had loaded them in the other order it would have masked the other one. In fact it masked seven functions in total in this case as the message told you. Michael On 23/06/2020 16:29, K Amoatwi wrote:> Dear Wolfgang, > Yes! The "metafor::forest(result.md)" works > > Thank you very much. > > Any reason why "forest(result.md)" was not working? > > Kobby > > On Tue, Jun 23, 2020 at 11:18 AM Viechtbauer, Wolfgang (SP) < > wolfgang.viechtbauer at maastrichtuniversity.nl> wrote: > >> You have loaded the 'meta' package after 'metafor' and then forest() will >> try to use the corresponding function from the meta package and not >> metafor. With: >> >> metafor::forest(result.md) >> >> it should work. >> >> Best, >> Wolfgang >> >>> -----Original Message----- >>> From: K Amoatwi [mailto:amoatwik20 at gmail.com] >>> Sent: Tuesday, 23 June, 2020 16:37 >>> To: Viechtbauer, Wolfgang (SP) >>> Cc: r-help at r-project.org >>> Subject: Re: [R] Error message in meta-analysis package Metafor-weights >> ="" >>> >>> Dear Wolfgang, >>> I have posted the requested information you asked for. >>> >>>> sessionInfo() >>> R version 4.0.1 (2020-06-06) >>> Platform: x86_64-w64-mingw32/x64 (64-bit) >>> Running under: Windows 10 x64 (build 18362) >>> >>> Matrix products: default >>> >>> locale: >>> [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United >>> States.1252 >>> [3] LC_MONETARY=English_United States.1252 >>> LC_NUMERIC=C >>> [5] LC_TIME=English_United States.1252 >>> >>> attached base packages: >>> [1] stats graphics grDevices utils datasets methods base >>> >>> other attached packages: >>> [1] meta_4.12-0 reshape2_1.4.4 metafor_2.4-0 Matrix_1.2-18 >>> >>> loaded via a namespace (and not attached): >>> [1] Rcpp_1.0.4.6 lattice_0.20-41 MASS_7.3- >>> 51.6 grid_4.0.1 >>> [5] plyr_1.8.6 nlme_3.1- >>> 148 magrittr_1.5 stringi_1.4.6 >>> [9] minqa_1.2.4 nloptr_1.2.2.1 boot_1.3- >>> 25 splines_4.0.1 >>> [13] statmod_1.4.34 lme4_1.1- >>> 23 tools_4.0.1 stringr_1.4.0 >>> [17] CompQuadForm_1.4.3 compiler_4.0.1 >>>> >>> >>>> class(result.md) >>> [1] "rma.uni" "rma" >>>> >>> >>> Thank you >>> Kobby >>> >>> On Tue, Jun 23, 2020 at 3:24 AM Viechtbauer, Wolfgang (SP) >>> <wolfgang.viechtbauer at maastrichtuniversity.nl> wrote: >>> Dear Kobby, >>> >>> Please post the output of sessionInfo() and class(result.md). >>> >>> Best, >>> Wolfgang >>> >>>> -----Original Message----- >>>> From: K Amoatwi [mailto:amoatwik20 at gmail.com] >>>> Sent: Monday, 22 June, 2020 22:30 >>>> To: Viechtbauer, Wolfgang (SP) >>>> Cc: r-help at r-project.org >>>> Subject: Re: [R] Error message in meta-analysis package Metafor-weights >> ="" >>>> >>>> Hi Wolfgang and All, >>>> I am still practising my meta-analysis with the "Metafor" package, I >> tried >>>> to run the code for "Forest plot" and got error message as shown below: >>>> forest(result.md) >>>>> forest(result.md) >>>> Error in UseMethod("forest") : >>>> no applicable method for 'forest' applied to an object of class >>>> "c('rma.uni', 'rma')" >>>> >>>> Thank you in advance for your support >>>> >>>> regards >>>> Kobby >>>> >>>> On Tue, Jun 16, 2020 at 12:50 PM Viechtbauer, Wolfgang (SP) >>>> <wolfgang.viechtbauer at maastrichtuniversity.nl> wrote: >>>> Dear Amoatwi, >>>> >>>> This way of using the escalc() function has been deprecated. It might be >>>> added back once there is actually any benefit from having this >>>> functionality, but for years it just meant that I had to maintain two >>>> different ways of doing the exact same thing without any additional >>>> benefits. >>>> >>>> Best, >>>> Wolfgang >>>> >>>> -- >>>> Wolfgang Viechtbauer, Ph.D., Statistician | Department of Psychiatry and >>>> Neuropsychology | Maastricht University | P.O. Box 616 (VIJV1) | 6200 MD >>>> Maastricht, The Netherlands | +31 (43) 388-4170 | http://www.wvbauer.com >>>> >>>>> -----Original Message----- >>>>> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of K >> Amoatwi >>>>> Sent: Tuesday, 16 June, 2020 4:50 >>>>> To: r-help at r-project.org >>>>> Subject: [R] Error message in meta-analysis package Metafor-weights ="" >>>>> >>>>> Dear All, >>>>> I am using the example from one of the tutorial about "Metafor" package >>> and >>>>> "escalc" function, to learn how this package can be applied to do >>>>> meta-analysi; the code and the data is directly from the tutorials but >>>>> "weights=freq" option in the escalc function is given me error message >>>>> This is the code below: >>>>> >>>>> library(metafor) # Load package >>>>> #####DATASET 1: BCG Vaccine Trials >>>>> data(dat.bcg) # BCG meta-analytic dataset >>>>> >>>>> ##Formula based Specification >>>>> ##That is, what if I have multiple rows per study, corresponding to >>>>> difference treatment groups? >>>>> >>>>> library(reshape2) # Load package for data reshaping >>>>> >>>>> bcg.long <- melt(dat.bcg[, c("trial", "tpos", "tneg", "cpos", "cneg")], >> id >>>>> = "trial") >>>>> bcg.long$pos <- ifelse(bcg.long$var == "tpos" | bcg.long$var == "cpos", >> 1, >>>>> 0) >>>>> bcg.long$group <- ifelse(bcg.long$var == "tpos" | bcg.long$var =>> "tneg", >>>>> 1, 0) >>>>> >>>>> ##sample of the data, the first 6 rows >>>>> head(bcg.long) >>>>> trial variable value pos group >>>>> 1 1 tpos 4 1 1 >>>>> 2 2 tpos 6 1 1 >>>>> 3 3 tpos 3 1 1 >>>>> 4 4 tpos 62 1 1 >>>>> 5 5 tpos 33 1 1 >>>>> 6 6 tpos 180 1 1 >>>>> >>>>> ##Now applying the " escalc " function >>>>> >>>>> escalc(factor(pos)~factor(group)| factor(trial),weights = value,data >>>>> bcg.long, measure = "OR") >>>>> >>>>> ##Then I got this error message >>>>> Error in escalc(factor(pos) ~ factor(group) | factor(trial), weights >>>>> value, : >>>>> object 'value' not found >>>>> >>>>> I used the same data with different example from another author and got >> a >>>>> similar error message >>>>> Second code with the same data but different coding >>>>> Sample data >>>>> >>>>> with the first 6 rows of the rearranged data shown below. (T=treatment, >>>>> C=Control group, Out=outcome whether positive or negative, and then >>>>> frequency) >>>>> study grp out freq >>>>> 1 1 T + 4 >>>>> 2 1 T - 119 >>>>> 3 1 C + 11 >>>>> 4 1 C - 128 >>>>> 5 2 T + 6 >>>>> 6 2 T - 300 >>>>> >>>>>> escalc(out ~ grp | study, weights = freq, data = dat.fm, measure >> "OR") >>>>> >>>>> Error in escalc(out ~ grp | study, weights = freq, data = dat.fm, >> measure >>> >>>>> "OR") : >>>>> object 'freq' not found >>>>> >>>>> I am not sure what I am doing wrong since both authors were able to get >>>>> their results while I am getting error messages. >>>>> >>>>> Any help will be very much appreciated >>>>> >>>>> Amoatwi >> > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >-- Michael http://www.dewey.myzen.co.uk/home.html
K Amoatwi
2020-Jun-23 15:58 UTC
[R] Error message in meta-analysis package Metafor-weights =""
Thank Michael and Wolfgang, very much appreciated. Kobby On Tue, Jun 23, 2020 at 11:39 AM Michael Dewey <lists at dewey.myzen.co.uk> wrote:> The two packages both define a function forest. When you load the second > package R will have told you that it was masking the definition of > forest from the first package. If you had loaded them in the other order > it would have masked the other one. > > In fact it masked seven functions in total in this case as the message > told you. > > Michael > > On 23/06/2020 16:29, K Amoatwi wrote: > > Dear Wolfgang, > > Yes! The "metafor::forest(result.md)" works > > > > Thank you very much. > > > > Any reason why "forest(result.md)" was not working? > > > > Kobby > > > > On Tue, Jun 23, 2020 at 11:18 AM Viechtbauer, Wolfgang (SP) < > > wolfgang.viechtbauer at maastrichtuniversity.nl> wrote: > > > >> You have loaded the 'meta' package after 'metafor' and then forest() > will > >> try to use the corresponding function from the meta package and not > >> metafor. With: > >> > >> metafor::forest(result.md) > >> > >> it should work. > >> > >> Best, > >> Wolfgang > >> > >>> -----Original Message----- > >>> From: K Amoatwi [mailto:amoatwik20 at gmail.com] > >>> Sent: Tuesday, 23 June, 2020 16:37 > >>> To: Viechtbauer, Wolfgang (SP) > >>> Cc: r-help at r-project.org > >>> Subject: Re: [R] Error message in meta-analysis package Metafor-weights > >> ="" > >>> > >>> Dear Wolfgang, > >>> I have posted the requested information you asked for. > >>> > >>>> sessionInfo() > >>> R version 4.0.1 (2020-06-06) > >>> Platform: x86_64-w64-mingw32/x64 (64-bit) > >>> Running under: Windows 10 x64 (build 18362) > >>> > >>> Matrix products: default > >>> > >>> locale: > >>> [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United > >>> States.1252 > >>> [3] LC_MONETARY=English_United States.1252 > >>> LC_NUMERIC=C > >>> [5] LC_TIME=English_United States.1252 > >>> > >>> attached base packages: > >>> [1] stats graphics grDevices utils datasets methods base > >>> > >>> other attached packages: > >>> [1] meta_4.12-0 reshape2_1.4.4 metafor_2.4-0 Matrix_1.2-18 > >>> > >>> loaded via a namespace (and not attached): > >>> [1] Rcpp_1.0.4.6 lattice_0.20-41 MASS_7.3- > >>> 51.6 grid_4.0.1 > >>> [5] plyr_1.8.6 nlme_3.1- > >>> 148 magrittr_1.5 stringi_1.4.6 > >>> [9] minqa_1.2.4 nloptr_1.2.2.1 boot_1.3- > >>> 25 splines_4.0.1 > >>> [13] statmod_1.4.34 lme4_1.1- > >>> 23 tools_4.0.1 stringr_1.4.0 > >>> [17] CompQuadForm_1.4.3 compiler_4.0.1 > >>>> > >>> > >>>> class(result.md) > >>> [1] "rma.uni" "rma" > >>>> > >>> > >>> Thank you > >>> Kobby > >>> > >>> On Tue, Jun 23, 2020 at 3:24 AM Viechtbauer, Wolfgang (SP) > >>> <wolfgang.viechtbauer at maastrichtuniversity.nl> wrote: > >>> Dear Kobby, > >>> > >>> Please post the output of sessionInfo() and class(result.md). > >>> > >>> Best, > >>> Wolfgang > >>> > >>>> -----Original Message----- > >>>> From: K Amoatwi [mailto:amoatwik20 at gmail.com] > >>>> Sent: Monday, 22 June, 2020 22:30 > >>>> To: Viechtbauer, Wolfgang (SP) > >>>> Cc: r-help at r-project.org > >>>> Subject: Re: [R] Error message in meta-analysis package > Metafor-weights > >> ="" > >>>> > >>>> Hi Wolfgang and All, > >>>> I am still practising my meta-analysis with the "Metafor" package, I > >> tried > >>>> to run the code for "Forest plot" and got error message as shown > below: > >>>> forest(result.md) > >>>>> forest(result.md) > >>>> Error in UseMethod("forest") : > >>>> no applicable method for 'forest' applied to an object of class > >>>> "c('rma.uni', 'rma')" > >>>> > >>>> Thank you in advance for your support > >>>> > >>>> regards > >>>> Kobby > >>>> > >>>> On Tue, Jun 16, 2020 at 12:50 PM Viechtbauer, Wolfgang (SP) > >>>> <wolfgang.viechtbauer at maastrichtuniversity.nl> wrote: > >>>> Dear Amoatwi, > >>>> > >>>> This way of using the escalc() function has been deprecated. It might > be > >>>> added back once there is actually any benefit from having this > >>>> functionality, but for years it just meant that I had to maintain two > >>>> different ways of doing the exact same thing without any additional > >>>> benefits. > >>>> > >>>> Best, > >>>> Wolfgang > >>>> > >>>> -- > >>>> Wolfgang Viechtbauer, Ph.D., Statistician | Department of Psychiatry > and > >>>> Neuropsychology | Maastricht University | P.O. Box 616 (VIJV1) | 6200 > MD > >>>> Maastricht, The Netherlands | +31 (43) 388-4170 | > http://www.wvbauer.com > >>>> > >>>>> -----Original Message----- > >>>>> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of K > >> Amoatwi > >>>>> Sent: Tuesday, 16 June, 2020 4:50 > >>>>> To: r-help at r-project.org > >>>>> Subject: [R] Error message in meta-analysis package Metafor-weights > ="" > >>>>> > >>>>> Dear All, > >>>>> I am using the example from one of the tutorial about "Metafor" > package > >>> and > >>>>> "escalc" function, to learn how this package can be applied to do > >>>>> meta-analysi; the code and the data is directly from the tutorials > but > >>>>> "weights=freq" option in the escalc function is given me error > message > >>>>> This is the code below: > >>>>> > >>>>> library(metafor) # Load package > >>>>> #####DATASET 1: BCG Vaccine Trials > >>>>> data(dat.bcg) # BCG meta-analytic dataset > >>>>> > >>>>> ##Formula based Specification > >>>>> ##That is, what if I have multiple rows per study, corresponding to > >>>>> difference treatment groups? > >>>>> > >>>>> library(reshape2) # Load package for data reshaping > >>>>> > >>>>> bcg.long <- melt(dat.bcg[, c("trial", "tpos", "tneg", "cpos", > "cneg")], > >> id > >>>>> = "trial") > >>>>> bcg.long$pos <- ifelse(bcg.long$var == "tpos" | bcg.long$var => "cpos", > >> 1, > >>>>> 0) > >>>>> bcg.long$group <- ifelse(bcg.long$var == "tpos" | bcg.long$var => >> "tneg", > >>>>> 1, 0) > >>>>> > >>>>> ##sample of the data, the first 6 rows > >>>>> head(bcg.long) > >>>>> trial variable value pos group > >>>>> 1 1 tpos 4 1 1 > >>>>> 2 2 tpos 6 1 1 > >>>>> 3 3 tpos 3 1 1 > >>>>> 4 4 tpos 62 1 1 > >>>>> 5 5 tpos 33 1 1 > >>>>> 6 6 tpos 180 1 1 > >>>>> > >>>>> ##Now applying the " escalc " function > >>>>> > >>>>> escalc(factor(pos)~factor(group)| factor(trial),weights = value,data > > >>>>> bcg.long, measure = "OR") > >>>>> > >>>>> ##Then I got this error message > >>>>> Error in escalc(factor(pos) ~ factor(group) | factor(trial), weights > > >>>>> value, : > >>>>> object 'value' not found > >>>>> > >>>>> I used the same data with different example from another author and > got > >> a > >>>>> similar error message > >>>>> Second code with the same data but different coding > >>>>> Sample data > >>>>> > >>>>> with the first 6 rows of the rearranged data shown below. > (T=treatment, > >>>>> C=Control group, Out=outcome whether positive or negative, and then > >>>>> frequency) > >>>>> study grp out freq > >>>>> 1 1 T + 4 > >>>>> 2 1 T - 119 > >>>>> 3 1 C + 11 > >>>>> 4 1 C - 128 > >>>>> 5 2 T + 6 > >>>>> 6 2 T - 300 > >>>>> > >>>>>> escalc(out ~ grp | study, weights = freq, data = dat.fm, measure > >> "OR") > >>>>> > >>>>> Error in escalc(out ~ grp | study, weights = freq, data = dat.fm, > >> measure > >>> > >>>>> "OR") : > >>>>> object 'freq' not found > >>>>> > >>>>> I am not sure what I am doing wrong since both authors were able to > get > >>>>> their results while I am getting error messages. > >>>>> > >>>>> Any help will be very much appreciated > >>>>> > >>>>> Amoatwi > >> > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > -- > Michael > http://www.dewey.myzen.co.uk/home.html >[[alternative HTML version deleted]]