Displaying 20 results from an estimated 3000 matches similar to: "Is there any design based two proportions z test?"
2024 Jan 17
1
Is there any design based two proportions z test?
Dear Md Kamruzzaman,
To answer your second question first, you could just use the svychisq()
function. The difference-of-proportion test is equivalent to a chisquare
test for the 2-by-2 table.
You don't say how you computed the confidence intervals for the two
separate proportions, but if you have their standard errors (and if not,
you should be able to infer them from the confidence
2024 Jan 18
0
Is there any design based two proportions z test?
Dear Md Kamruzzaman,
I've copied this response to the r-help list, where you originally asked
your question. That way, other people can follow the conversation, if
they're interested and there will be a record of the solution. Please
keep r-help in the loop
See below:
On 2024-01-17 9:47 p.m., Md. Kamruzzaman wrote:
>
> Caution: External email.
>
>
> Dear John
>
2009 Feb 26
1
error message and convergence issues in fitting glmer in package lme4
I'm resending this message because I did not include a subject line in my first posting.
Apologies for the inconvenience!
Tanja
> Hello,
>
> I'm trying to fit a generalized linear mixed model to estimate diabetes prevalence at US county level. To do this I'm using the glmer() function in package lme4. I can fit relatively simple models (i.e. few covariates) but when
2023 Nov 03
1
I need to create new variables based on two numeric variables and one dichotomize conditional category variables.
Well, something like:
LAP <- ifelse(gender =='male', (WC-65)*TG, (WC-58)*TG)
The exact code depends on whether your variables are in a data frame or
list or whatever, which you failed to specify. If so, ?with may be useful.
Cheers,
Bert
On Fri, Nov 3, 2023 at 3:43?AM Md. Kamruzzaman <mkzaman.m at gmail.com> wrote:
> Hello Everyone,
> I have three variables: Waist
2023 Nov 03
1
I need to create new variables based on two numeric variables and one dichotomize conditional category variables.
Hello Everyone,
I have three variables: Waist circumference (WC), serum triglyceride (TG)
level and gender. Waist circumference and serum triglyceride is numeric and
gender (male and female) is categorical. From these three variables, I want
to calculate the "Lipid Accumulation Product (LAP) Index". The equation to
calculate LAP is different for male and females. I am giving both
2009 Feb 26
1
(no subject)
Hello,
I'm trying to fit a generalized linear mixed model to estimate diabetes prevalence at US county level. To do this I'm using the glmer() function in package lme4. I can fit relatively simple models (i.e. few covariates) but when expanding the number of covariates I usually encounter the following error message.
gm8 <-
2023 Nov 03
1
I need to create new variables based on two numeric variables and one dichotomize conditional category variables.
df$LAP <- with(df, ifelse(G=='male', (WC-65)*TG, (WC-58)*TG))
That will do both calculations and merge the two vectors appropriately. It will use extra memory, but it should be much faster than a 'for' loop.
Regards,
Jorgen Harmse.
------------------------------
Message: 8
Date: Fri, 3 Nov 2023 11:10:49 +1030
From: "Md. Kamruzzaman" <mkzaman.m at gmail.com>
2023 Nov 03
2
I need to create new variables based on two numeric variables and one dichotomize conditional category variables.
Just a minor point in the suggested solution:
df$LAP <- with(df, ifelse(G=='male', (WC-65)*TG, (WC-58)*TG))
since WC and TG are not conditional, would this be a slight improvement?
df$LAP <- with(df, TG*(WC - ifelse(G=='male', 65, 58)))
-----Original Message-----
From: R-help <r-help-bounces at r-project.org> On Behalf Of Jorgen Harmse via
R-help
Sent: Friday,
2023 Nov 03
1
[EXTERNAL] RE: I need to create new variables based on two numeric variables and one dichotomize conditional category variables.
Yes, that will halve the number of multiplications.
If you?re looking for such optimisations then you can also consider ifelse(G=='male', 65L, 58L). That will definitely use less time & memory if WC is integer, but the trade-offs are more complicated if WC is floating point.
Regards,
Jorgen Harmse.
From: avi.e.gross at gmail.com <avi.e.gross at gmail.com>
Date: Friday,
2007 Jun 26
2
Aggregation of data frame with calculations of proportions
Dear all,
I have been stuck on this problem, am rather struggling and would
appreciate some advice if anyone can help. I apologise if this is a
bit long-winded, but I've tried to limit it to the bare essentials,
but don't know how to make it more generic!
I have some slightly odd real world data that I'm looking at
representing number of positive diagnoses for different diseases,
2023 Dec 18
3
Function with large nested list
Hello list,
I want to make a large rulebased algorithm, to provide decision support for drug prescriptions. I have defined the algorithm in a function, with a for loop and many if statements. The structure should be as follows:
1. Iterate over a list of drug names. For each drug:
2. Get some drug related data (external dataset). Row of a dataframe.
3. Check if adaptions should be made to
2011 Jun 16
2
Bayesian Credible Intervals for a Proportion
I am trying to calculate Bayesian Credible Intervals for a proportion
(disease prevalence values to be more specific) and am having trouble using
R to do this. I am working with ncredint() function but have not had success
with it. Please help!
Example:
Positive samples = 3
Total sampled = 10
Prevalence = 0.3
pvec <- seq(1,10,by=1)
npost = dbinom(pvec,10,prob=0.3, log=FALSE)
ncredint(pvec,
2009 May 22
1
bug in rpart?
Greetings,
I checked the Indian diabetes data again and get one tree for the data with
reordered columns and another tree for the original data. I compared these
two trees, the split points for these two trees are exactly the same but the
fitted classes are not the same for some cases. And the misclassification
errors are different too. I know how CART deal with ties --- even we are
using the
2006 Mar 26
1
Newbie clustering/classification question
My laboratory is measuring the abundance of various proteins in the
blood from either healthy individuals or from individuals with various
diseases. I would like to determine which proteins, if any, have
significantly different abundances between the healthy and diseased
individuals. Currently, one of my colleagues is performing an ANOVA on
each protein with MS Excel. I would like to analyze
2009 Jul 10
1
prevalence in logistic regression lrm()
Hi, I am wondering if there is a way to specify the prevalence of events in logistic regression using lrm() from Design package? Linear Discriminant Analysis using lda() from MASS library has an argument "prior=" that we can use to specify the prevalent of events when the actual dataset being analyzed does not have a representative prevalence. How can we incorporate this information in
2009 May 12
1
questions on rpart (tree changes when rearrange the order of covariates?!)
Greetings,
I am using rpart for classification with "class" method. The test data is
the Indian diabetes data from package mlbench.
I fitted a classification tree firstly using the original data, and then
exchanged the order of Body mass and Plasma glucose which are the
strongest/important variables in the growing phase. The second tree is a
little different from the first one. The
2012 Oct 03
2
Legend Truncated Using filled.contour
Hey everyone,
I'm working on a contour plot depicting asymptomatic prevalence at varying
durations of infectiousness and force of infection. I've been able to work
everything out except for this one - my legend title keeps getting cut off.
Here's what I have:
filled.contour(x=seq(2,30,length.out=nrow(asym_matrix)),
y=seq(1,2,length.out=ncol(asym_matrix)),
asym_matrix,
color =
2009 Oct 27
1
"ipredknn" - How may I find values?
Hi everybody!
I want to find a closer neighbourins observation. This is my code:
##########################
library(klaR)
library(ipred)
library(mlbench)
data(PimaIndiansDiabetes2)
dane=na.omit(PimaIndiansDiabetes2)[,c(2,5,9)]
dane[,2]=log(dane[,2])
dane[,1:2]=scale(dane[,1:2])
zbior.uczacy=sample(1:nrow(dane),nrow(dane)/2,F)
2013 Apr 25
1
Assigning a variable value based on multiple columns
Hi All,
I'm hoping someone can help me with a relatively simple problem. Take the following dataset:
ID Diabetes ESRD HIV Contact
1 0 0 NA 0
2 1 0 NA 0
3 NA 1 0 0
4 0 NA 0 1
5 1 1 1 0
I want to generate a
2020 Feb 19
2
How to index the occasions in a vector repeatedly under condition 1? if not, it will give a new index.
Dear all,
Could you please help me how to get the output as I described in the following example?
x<-c(543, 543, 543, 543, 551 , 551 ,1128 ,1197, 1197)
diff<-x-lag(x)
diff
[1] NA 0 0 0 8 0 577 69 0
How to index the occasions in x repeatedly if the diff<15? if diff>=15, it will give a new index.
I want the output be like y.
y<-c(1,1,1,1,1,1,2,3,3)
Thank you so