Displaying 20 results from an estimated 3000 matches similar to: "Use of the "by" command (clarification)"
2007 Jun 16
0
Use of the "by" command for gini()
I have a data set that contains income data and a group identifier. Sort of
like:
DATA
Group,Income
A,2300
B,6776
A,6668
A,6768
B,9879
C,5577
A,7867
(etc),(etc)
I am trying to compute the gini coefficient for each group.
I have tried the following and none seem to do the trick:
1)
attach(DATA)
by(DATA, group, function(x) gini(income))
2)
attach(data)
tapply(income, group,
2005 Jun 24
2
Gini with frequencies
Hi there,
I am trying to compute Gini coefficients for vectors containing income classes. The data I possess look loke this:
yit <- c(135, 164, 234, 369)
piit <- c(367, 884, 341, 74 )
where yit is the vector of income classes, and fit is the vector of associated frequencies.(This data is from Rustichini, Ichino and Checci (Journal of Public Economics, 1999) ). In ineq pacakge, Gini( )
2012 Feb 20
1
random numbers
Hello,
Is there a way to create random numbers that fit a certain specified
requirement other than distributional characteristics.
In particular, I would like to create simulated income distributions with
certain gini coefficient
Ryan
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Ryan Murphy
2012
B.A. Economics and Mathematics
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2001 Jan 10
1
gini index
Hi.
I have some data from a survey w/c include income data.
Was not quite sure how to generate the gini index on these
data.
Jose Ramon Albert
Statistical Research and Training Center
www.srtc.gov.ph
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Send "info",
2005 Feb 05
2
Std Err on Concentration measures
Hi,
I'm using the ineq package to calculate some concentration measures (Gini, Herfindal, ...) and I was wondering if there's around also a function to calculate standard error on these measures. If not, is anybody aware of where I can find a reference on this point?
Thanks.
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Angelo Secchi PGP Key ID:EA280337
2011 Jun 13
1
In rpart, how is "improve" calculated? (in the "class" case)
Hi all,
I apologies in advance if I am missing something very simple here, but since
I failed at resolving this myself, I'm sending this question to the list.
I would appreciate any help in understanding how the rpart function is
(exactly) computing the "improve" (which is given in fit$split), and how it
differs when using the split='information' vs split='gini'
2010 Sep 03
7
Function Gini or Ineq
Hi listers,
Does it necessary to install any package in order to use the GINI or INEQ
functions.
If I use the following command the R tells me that didn't find the GINI
function.
x<-c(541, 1463, 2445, 3438, 4437, 5401, 6392, 8304, 11904, 22261)
G<-gini(x)
Thanks in advance,
Marcio
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2016 Mar 30
2
Compute the Gini coefficient
Hello,
I would like to build a Lorenz curve and calculate a Gini coefficient in order to find how much parasites does the top 20% most infected hosts support.
Here is my data set:
Number of parasites per host:
parasites = c(0,1,2,3,4,5,6,7,8,9,10)
Number of hosts associated with each number of parasites given above:
hosts = c(18,20,28,19,16,10,3,1,0,0,0)
To represent the Lorenz curve:
I
2007 Jun 11
1
Gini coefficient in R
If I use the Ineq library and the Gini function in this way:
>Gini(c(100,0,0,0))
I obtain the result 0.75 instead of 1 (that is the perfect inequality).
I think Gini's formula in Ineq is based on a formula as reported here:
http://mathworld.wolfram.com/GiniCoefficient.html
but in the case of perfect inequality:
x_1=.......=x_n-1 =0
x_n>0
these formula are equal to 1 - 1/n, not to
2010 Sep 28
3
calcular la variancia de gini por bootstrap
Hola, paso el mini programita q estoy viendo, lo q me llama la atencion es
una parte donde se definen las funciones.
Probe primero meter adentro del boots la estadistica a estimar usando
directamente gini(varible, pesos) pero no me dejo.
Vi q en el ej del manual de boots, siempre define antes la funcion, entonces
probe definir antes una funcion haciendo
grini<-function(x) {gini(variable,
2009 Sep 28
1
how to visualize gini coefficient in each node in RF?
Dear all,
I am working with randomForest package and I am interested in examining the
"Gini importance" measures that are used as a general indicator of feature
relevance. Is there a possibility of getting the Gini measure that is being
estimated in each tree by the output of the getTree() function?
Thanks a lot,
Chrysanthi
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2010 Oct 19
1
Gini Coefficient
Dear List,
I am unsure if this is specifically a R question or a stats question? I thought i would ask here and if i get no replies it will answer that!
I am trying to calculate Gini coefficients in R, based on a slight modification of the typical equation that i have seen in a paper.
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2012 Oct 26
1
Gini with bias correction
Hey there,
I was wondering if someone could tell me if there's a package or command
that allows me to compute a GINI coefficient using a vector of weights.
Also the coefficient should be bias corrected.
Diego Rojas
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2008 Apr 04
1
random forest varimp
Friends,
I have noticed that many publications that use RF report variable importance as
a function of mean decrease in accuracy rather than mean decrease in gini. Am I
correct that the mean decrease in accuracy is just the mean decrease in gini
divided by 100?
Thanks,
Helen Mills Poulos
Yale School of Forestry
2009 May 21
1
Rpart - best split selection for class method and Gini splitting index
Dear R-users,
I'm working with the Rpart package and trying to understand how the
procedure select the best split in the case the method "class" and the
splitting index "Gini" are used. In particular I'd like to have look to the
source code that works out the best split for un unordered predictor.
Does anyone can suggest me which functions in the sources I should
2008 Sep 27
1
ariable Importance Measure in Package RandomForest
Hi,
I've a question about the RandomForest package.
The package allows the extraction of a variable importance measure. As far as
I could see from the documentation, the computation is based on the Gini index.
Do you know if this extraction can be also based on other criteria? In particular,
I'm interested in the info gain criterion.
Best regards,
Chris
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2010 Apr 08
2
C-index and Cox model
Dear all R users,
I am building a Cox PH model on a small dataset. I am wondering how to
measure the predictive power of my cox model? Normally the ROC curve or Gini
value are used in logistic regression model. Is there any similar
measurement suitable for Cox model?
Also if I use C-index statistic to measure the predictive power, is it a
time-dependent value (i.e. do I need to calculate it for
2008 Aug 19
2
Writing R Extensions : A new R package for Gini Index decomposition to prupose
Dear All,
I have developed a programme the anable the decomposition of the Gini index, it complets tha valuable work of Achim Zeileis, the author of the ineq package.
I would like to make it to be part of all R package. How should I proceed.
Must I sent it to the the Core developement team ?
The proogramme is written in R.
Many thanks for your advice,
Best regards,
Souleymane
2008 Feb 11
1
Gini index of frequencies in a data frame
Dear All,
I wish to calculate the Gini index (ineq from same package) and some other indices for the diameter distribution of each plot (df dgtot).
dgtot:
IDPlot Diameter(cm)
1 4 34.0
2 4 23.0
3 4 38.0
...
51 5 16.0
52 5 8.0
53 5 9.0
...
5301 140 25.0
5302 140 12.0
5303 140 7.0
I use:
>
2005 Aug 26
2
learning decision trees with one's own scoring functins
Hi netters,
I want to learn a decision tree from a series of instances (learning data).
The packages
tree or rpart can do this quite well, but the scoring functions (splitting
criteria) are
fixed in these packages, like gini or something. However, I'm going to use
another scoring
function.
At first I wanna modify the R code of tree or rpart and put my own scoring
function in. But it