[R-sig-Epi] help

[BXC (Bendix Carstensen)]

Dear Khan,
I am afraid that the help list is not an online-course.
The questions you ask are too general for this forum, they would be suitable for a teacher at an appropriate course in epidemidological methods.

For introduction to very basics of R in epidemiology you may benefit from the
"Workbook introduction to R", see, http://www.mhills.pwp.blueyonder.co.uk/Rwork_book.html

Best regards,
Bendix Carstensen 

> -----Original Message-----
> From: Dr Khan Amir Maroof [mailto:khanamirmaroof at gmail.com] 
> Sent: 29. november 2010 15:55
> To: BXC (Bendix Carstensen)
> Subject: Re: [R-sig-Epi] help
> 
> Sir,
>  
> I want to know how to write the command for this problem.
>  
> I have entered the data in epidata and the variables are: 
> age, hadwateryesterday, hadthinporridgeyesterday.
> age is a numeric variable containing numbers 0-23 months.
> the other two variables are factor variables: having 0 for 
> no, 1 for yes and 8 for don't know
>  
> how to write command if i want to get the following 
> descriptive statistics:
> proportion of children less than 6 months for whom 
> hadwateryesterday and hadthinporridgeyesterday is 0.
>  
> I think in my last email, I was not able to explain my 
> problem correctly.
> Also I am a novice in using R, so my questions are very basic 
> as I have to master first how to write correct commands.
>  
> Thanks for your help.
> 
> 
>  
> On Mon, Nov 29, 2010 at 1:42 AM, BXC (Bendix Carstensen) 
> <bxc at steno.dk> wrote:
> 
> 
> 	You make a three-way table to see how breastfeeding 
> varies with the two others.
> 	You could also analyse by logistic regression.
> 	
> 	Best regards,
> 	Bendix
> 	
> 
> 	> -----Original Message-----
> 	> From: Dr Khan Amir Maroof [mailto:khanamirmaroof at gmail.com]
> 	> Sent: 29. november 2010 03:57
> 	> To: BXC (Bendix Carstensen)
> 	> Subject: Re: [R-sig-Epi] help
> 	>
> 	> thanx for your reply.
> 	>
> 	> i m posting my original problem. i hv a variables: 'age' in
> 	> completed months frm 0 to 23; 'took water yesterday' as 1 for
> 	> yes, 2 for no and 8 for don't know; 'took thin porridge
> 	> yesterday' as 1 for yes, 2 for no and 8 for don't know. now i
> 	> hv to find out this: if took water yesterday or took thin
> 	> porridge yesterday by children less than 6 months of age,
> 	> then they are not exclusively breastfed, whereas if not taken
> 	> any of these yesterday then they are exclusively breastfed.
> 	>
> 	> kindly let me know how to do this in R or epicalc.
> 	>
> 	> thanking you.
> 	>
> 	>
> 	> On Sun, Nov 28, 2010 at 12:47 PM, BXC (Bendix Carstensen)
> 	> <bxc at steno.dk> wrote:
> 	>
> 	>
> 	>       It sounds as if you are looking for something like
> 	>
> 	>       newvar <- as.numeric(var1=="yes")
> 	>
> 	>       or
> 	>
> 	>       newvar <- as.numeric(var1==1)
> 	>
> 	>       depending on whether var1 is numeric or character.
> 	>
> 	>       Best regards,
> 	>       Bendix Carstensen
> 	>
> 	>
> 	>       > -----Original Message-----
> 	>       > From: r-sig-epi-bounces at r-project.org
> 	>       > [mailto:r-sig-epi-bounces at r-project.org] On 
> Behalf Of Dr Khan
> 	>       > Amir Maroof
> 	>       > Sent: 27. november 2010 16:31
> 	>       > To: r-sig-epi at stat.math.ethz.ch
> 	>       > Subject: [R-sig-Epi] help
> 	>       >
> 	>       > Sir,
> 	>       >
> 	>       > Its wonderful to start using this software R. 
> I am making
> 	>       > full efforts to learn it on my own with the 
> help of the free
> 	>       > online manuals available. I am using epicalc 
> package in R. I
> 	>       > have a dataset where i want to apply 
> conditions like... if
> 	>       > var1 is yes or 1, assign 1 to it or else 0. 
> Can you help me
> 	>       > with this problem?
> 	>       >
> 	>       > Thanking you,
> 	>       >
> 	>       > --
> 	>       > Dr. Khan Amir Maroof,
> 	>       > Lecturer,
> 	>       > Department of Community Medicine,
> 	>       > University College of Medical Sciences & GTB 
> Hospital, Delhi
> 	>       >
> 	>
> 	>       >       [[alternative HTML version deleted]]
> 	>       >
> 	>       > _______________________________________________
> 	>       > R-sig-Epi at r-project.org mailing list
> 	>       > https://stat.ethz.ch/mailman/listinfo/r-sig-epi
> 	>       >
> 	>
> 	>
> 	>
> 	>
> 	> --
> 	> Dr. Khan Amir Maroof,
> 	> Lecturer,
> 	> Department of Community Medicine,
> 	> University College of Medical Sciences & GTB Hospital, Delhi
> 	> www.teachingcommunitymedicine.blogspot.com 
> <http://www.teachingcommunitymedicine.blogspot.com/> 
> 	>
> 	>
> 	> 
> 
> 
> 
> 
> --
> Dr. Khan Amir Maroof,
> Lecturer,
> Department of Community Medicine,
> University College of Medical Sciences & GTB Hospital, Delhi 
> www.teachingcommunitymedicine.blogspot.com 
> <http://www.teachingcommunitymedicine.blogspot.com/> 
> 
> 
>