On Oct 8, 2012, at 9:06 AM, Rerda wrote:
> Dear Rui and David
> Thank you very much for taking your time to look at my problem.
> However, I still cannot seem to figure it out.
>
> I think that you David are corect in your assumption of how my data is
> structured. The data in the two columns that I need to cross-table is either
> 1 or 0.
> I made a mistanke in the formula that I sent to you. The one I use is:
> data <- matrix(c(sum(!Variable[Group....==1]), sum(Variable[Group....==1]),
> sum(!Variable[Group....==0]), sum(Variable[Group....==0])),2,2)
Hardly seems surprising that is not working, ... the is no "Group...." column
in the data. Furthermore you would not need to use sum( !Variable[Group....==1]
as well as sum(Variable[Group....==1]). The `table` function will do that for
you.
Given my personal memory of having a hypotensive episode as I stood at the
counter of a pharmacy asking for epinephrine and a syringe to treat my
urticarial reaction to shellfish, I picked these two:
> with( MyData, table( Rash= as.logical(Rash), Hypotension =
> as.logical(Hypotension) ) )
Hypotension
Rash FALSE TRUE
FALSE 3 7
TRUE 7 3
Best;
David.
>
>
> This is the output of >dput( head(MyData, 20) ):
>
> structure(list(Patient.nr = c(1L, 3L, 4L, 5L, 6L, 7L, 9L, 10L,
> 11L, 12L, 13L, 14L, 15L, 16L, 19L, 20L, 21L, 22L, 23L, 24L),
> DAAC.... = c(0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
> 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L), TAA = c(0L, 0L, 0L,
> 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
> 0L, 0L), Sex = c(0L, 0L, 0L, 0L, 0L, 0L, 0L, 1L, 0L, 0L,
> 0L, 0L, 1L, 0L, 0L, 1L, 1L, 0L, 0L, 0L), Alder = c(1L, 6L,
> 3L, 3L, 6L, 6L, 2L, 6L, 5L, 2L, 6L, 4L, 6L, 2L, 2L, 5L, 3L,
> 6L, 6L, 6L), Reak.1 = structure(c(2L, 1L, 2L, 2L, 1L, 2L,
> 2L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 1L, 2L, 1L, 1L, 2L), .Label = c("0",
> "1", "na"), class = "factor"), Reak.2 = structure(c(1L, 1L,
> 1L, 1L, 2L, 1L, 1L, 1L, 1L, 2L, 1L, 1L, 2L, 1L, 1L, 2L, 1L,
> 2L, 1L, 1L), .Label = c("0", "2", "na"), class = "factor"),
> Reak.3 = structure(c(1L, 2L, 1L, 1L, 1L, 1L, 1L, 2L, 2L,
> 1L, 2L, 2L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 1L), .Label = c("0",
> "3", "na"), class = "factor"), Reak.4 = structure(c(1L, 1L,
> 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
> 1L, 1L, 1L), .Label = c("0", "4", "na"), class = "factor"),
> Tryptase = structure(c(1L, 1L, 1L, 3L, 1L, 3L, 1L, 2L, 2L,
> 1L, 3L, 3L, 1L, 3L, 3L, 3L, 3L, 3L, 2L, 1L), .Label = c("0",
> "1", "na"), class = "factor"), Hypotension = c(0L, 1L, 0L,
> 0L, 1L, 0L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 0L, 0L, 0L, 0L, 0L,
> 1L, 0L), Tachycardia = c(0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
> 1L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 1L, 0L, 0L), Br.spasm. = c(0L,
> 1L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 1L, 0L, 0L, 0L, 0L, 0L,
> 0L, 0L, 0L, 0L), Angioedema = c(0L, 0L, 0L, 1L, 0L, 1L, 0L,
> 0L, 1L, 0L, 0L, 0L, 0L, 0L, 0L, 1L, 0L, 0L, 0L, 0L), Urticaria = c(0L,
> 0L, 0L, 0L, 0L, 0L, 1L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
> 0L, 0L, 0L, 0L), Flush. = c(0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
> 0L, 1L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L), Rash = c(1L,
> 0L, 1L, 0L, 1L, 0L, 0L, 1L, 0L, 0L, 0L, 0L, 1L, 1L, 1L, 0L,
> 1L, 1L, 0L, 1L), Pruritus = c(0L, 0L, 0L, 0L, 0L, 0L, 0L,
> 1L, 0L, 1L, 0L, 1L, 0L, 1L, 0L, 0L, 1L, 1L, 0L, 0L), Transf. = c(0L,
> 0L, 0L, 0L, 0L, 0L, 0L, 0L, 1L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
> 0L, 0L, 0L, 0L)), .Names = c("Patient.nr", "DAAC....", "TAA",
> "Sex", "Alder", "Reak.1", "Reak.2", "Reak.3", "Reak.4", "Tryptase",
> "Hypotension", "Tachycardia", "Br.spasm.", "Angioedema", "Urticaria",
> "Flush.", "Rash", "Pruritus", "Transf."), row.names = c(NA, 20L
> ), class = "data.frame")
>
> And I still can get it to work.
> Is it possible to put is.na(Variable) or something into my formula?
>
> I understand if it is to difficult to figure it put.
> Thank you very much
>
> Kind Regards Gerda
>
>
>
> --
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> http://r.789695.n4.nabble.com/Missing-data-Na-and-chi-square-tests-tp4645167p4645464.html
> Sent from the R help mailing list archive at Nabble.com.
>
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David Winsemius, MD
Alameda, CA, USA
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