I already did try the regression modeling approach. However the epidemiologists
(referee) turns out to be quite fond of comparing the incidence rates to
different standard populations, hence the need for this labourius approach.
And trying the "cutting" approach I ended up with :
> table (age5)
age5
(0,5] (5,10] (10,15] (15,20] (20,25] (25,30] (30,35] (35,40]
(40,45] (45,50] (50,55] (55,60] (60,65] (65,70] (70,75] (75,80] (80,85]
(85,100]
35 34 33 47 51 109 157 231
362 511 745 926 1002 866 547 247 82
18
> table (yr5)
yr5
(1950,1955] (1955,1960] (1960,1965] (1965,1970] (1970,1975] (1975,1980]
(1980,1985] (1985,1990] (1990,1995] (1995,2000] (2000,2005] (2005,2009]
3 5 5 5 5 5
5 5 5 5 5 3
> table (yr5,age5)
Error in table(yr5, age5) : all arguments must have the same length
Sincerely,
M
On 5. apr. 2010, at 20.59, Bert Gunter wrote:
> You have tempted, and being weak, I yield to temptation:
>
> "Any good ideas?"
>
> Yes. Don't do this.
>
> (what you probably really want to do is fit a model with age as a factor,
> which can be done statistically e.g. by logistic regression; or graphically
> using conditioning plots, e.g. via trellis graphics (the lattice package).
> This avoids the arbitrariness and discontinuities of binning by age range.)
>
> Bert Gunter
> Genentech Nonclinical Biostatistics
>
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf Of moleps
> Sent: Monday, April 05, 2010 11:46 AM
> To: r-help@r-project.org
> Subject: [R] Data manipulation problem
>
> Dear R´ers.
>
> I´ve got a dataset with age and year of diagnosis. In order to
> age-standardize the incidence I need to transform the data into a matrix
> with age-groups (divided in 5 or 10 years) along one axis and year divided
> into 5 years along the other axis. Each cell should contain the number of
> cases for that age group and for that period.
>
> I.e.
> My data format now is
> ID-age (to one decimal)-year(yearly data).
>
> What I´d like is
>
>
> age 1960-1965 1966-1970 etc...
> 0-5 3 8 10 15
> 6-10 2 5 8 13
> etc..
>
>
> Any good ideas?
>
> Regards,
> M
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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>
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