search for: ci1

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2002 Jun 06
2
R correlations.
Hi, anybody have any ideas on this ? I have two sequences of proportions. Due to conventions in my field, I need to produce a linear correlation between the two. Each sequence of proportions are based upon differing numbers of observations (although within a sequence the number of observations may not fluctuate too much) so it may be necessary/advisable to variance stabilize. Is their a best
2024 Jan 18
0
Is there any design based two proportions z test?
...that the variance of the difference of two independent random variables is the sum of their variances, plus the observation that the width of the confidence interval is 2*z*SE, where z is the normal quantile corresponding to the confidence level (e.g., 1.96 for a 95% CI). ciDiff <- function(ci1, ci2, level=0.95){ p1 <- mean(ci1) p2 <- mean(ci2) z <- qnorm((1 - level)/2, lower.tail=FALSE) se1 <- (ci1[2] - ci1[1])/(2*z) se2 <- (ci2[2] - ci2[1])/(2*z) seDiff <- sqrt(se1^2 + se2^2) (p1 - p2) + c(-z, z)*seDiff } > > Example: Prevalence of Diabete...
2006 Feb 01
1
several plots in one
...h each other. I also tried calling plotCI with argument add=TRUE, which didn't seem to work (that is actually what I wanted I think). (It should look the same as if I called plotCI twice with same labels/xlim/ylim/etc.) plotCI(x = cbind(x1,x2), y = cbind(means1,means2), # means1 == ci1["Estimate",] xlim = c(0,100), #ylim = c(0.2,0.5), ylab = "System welfare", pch = 7, col = c("red","blue"), type = "b", uiw = cbind(uiw1,uiw2)) Thanks in advance, JeeBee.
2008 Jan 02
6
problem when editing record in polymorphic relation
...:content end class Ci < ActiveRecord::Base belongs_to :content, :polymorphic => true end The table, cis ,contains the following records ============================================= id | ci_number | content_id | content_type ----+----------+-----------+------------+-------------- 1 | CI1 | 1 | SoftwareCi 2 | CI2 | 2 | SoftwareCi 3 | CI3 | 1 | HardwareCi 4 | CI4 | 2 | HardwareCi The table, software_cis ,contains the following records ===================================================== id | asset_tag | sta...