Use this tag for any *on-topic* question that (a) involves `R` either as a critical part of the question or expected answer, & (b) is not *just* about how to use `R`.

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8 views

Loss function selection for weighting errors differently

I am building a regression model where I want to score/optimize/train 'over-predictions' to be twice costly as under predictions. I am attempting to do this in R and hopefully with caret package. ...
1
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0answers
10 views

R Poisson process simulation for a queuing problem

I'm working on the problem - patients come into a clinic according to a Poisson process with time parameter 10 minutes starting from 9 am until 4pm when the clinic stops admitting new patients. There ...
0
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0answers
6 views

Creating Naive Bayes Model for numerical data in R

I want to calculate the missing value using the NaiveBayes predictor. I am using a dataset with missing values at some rows, ...
0
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0answers
8 views

Predict function in r - time series

I have built a model on my training dataset where I have used the difference of the log(Y) i.e. diff(log(Y)) as my response variable. Now if I want to use this for predicting the Y variable in my ...
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0answers
15 views

Selecting Subset of Quantitative Variables in R

Is there a way to generate a subset of my quantitative variables in R, without having to manually select them in the subset() command? I have very many quantitative variables, and it would be too time ...
1
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0answers
10 views

Optimal methods for bandwidth selection in kernel density estimation

I am looking for help in choosing a suitable method for bandwidth selection in kernel density estimation. I have six data sets with 50 to 200 observations each and aim to fit a continuous univariate ...
1
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0answers
17 views

Transformation of data with zero and R squared

I have a conceptual concern about data tranformation and R^2. Often we transform data to respect the assumption of the linear model. Therefore, we can use multiple type of transformation such as log ...
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0answers
11 views

Test for identifying structural breaks in daily financial time series data

I have daily data of Nifty from 2002 Jan 08 to 2014 March 31. I am trying to identify structural breaks in my data. I shall be very thankful if anyone can guide me as to what test shall I apply to ...
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0answers
24 views

How to use LDA results for prediction? And how to assess model fit?

I am trying to understand how to interpret the results I get from LDA. Running from the iris dataset in R, I can see the discriminant coefficients are in the model and then I can plot the model to ...
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0answers
12 views

Seasonal Time Series Modeling in SPSS Modeler (or R) & ARIMA

I've got a question regarding ARIMA modeling. I am having a hard time to make to model out the seasonalities of my time series. The pictures below shows my tries in modeling. The topic is to ...
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0answers
7 views

Not complete repeated measurement for linear mixed effect model in R using na.omit

I have measured the effect of different stimulation types in a group of subjects and I am using linear mixed effect models in R to check the effect of each stimulation type. Let's say I have ...
0
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0answers
13 views

loop and bootstrap in glm [on hold]

I have an example data (datasim) with binary outcome, Y and independent variables X1 till X10. ...
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0answers
5 views

Combine multiple independent variables into one variable in a GLM/GAM/GAMLSS model

In the R package gamlss there is a function centiles that according to the documentation is ...
1
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0answers
18 views

Setting column classes and defining any factor levels, without using loops in R [migrated]

I have been grappling with the following problem for a while, as I need to load in, manipulate, and produce scores from new datasets as quickly as possible. I have defined a data dictionary ...
1
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0answers
2 views

Generalized additive model

I need help on how to interpret results for Generalised Additive Models(GAM) in R using the mgcv package. I have a dataset called flood which has a dependent variable called year (1985-2014) and the ...
0
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1answer
35 views

A question on cosine similarity & k-means

I used the following code to perform clustering of a dataset in R. distMatrix1 <- dist(sample2, method="cosine") km<-kmeans(distMatrix1,3) I have got some ...
0
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0answers
24 views

Minimum Spanning Tree in R (vegan): managing identical values

In R the package "vegan" contains the function spantree. It takes a matrix of distances among terms and it creates a tree with all the points... unless two or more rows (ex: A, B, C) are identical. ...
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0answers
10 views

High survival probabilities for un-censored test observations when using RandomForestSRC

The survival probabilities when using the RandomForestSRC package are consistently very high for near-term time intervals. I would have assumed that the survival probability at least for those ...
0
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0answers
21 views

Rejection Sampling Not Giving Correct Distribution

I hope someone can check through all my steps to see where I made a mistake: I wish to create a sample with the density $\ f(x)=\frac{1-x}{(π-2)(x + 1)√x}$ using the [1,0] uniform distribution U, and ...
0
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0answers
3 views

Dividing lsmeans$constrasts output [migrated]

I'm trying to merge from Sigmaplot to R, and I'm getting some progress in reaching the same outputs. In Sigmaplot I use the Holm-Sidak correction, and that is the one which I am trying to achieve in R ...
1
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0answers
27 views

Splitting between train/test for customer churn survival models

I am a bit confused on how data can be split between train/test and "live" data for predicting churn using survival models such as the one in RandomForestSRC package. Goal of the model is to predict ...
0
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0answers
20 views

Error message in a nested Mixed Model in lme4

I'm trying to model the effect of a biomarker, Pentraxin3 on another biomarker, IL6 in a mixed model to account for correlations between the repeated measures and for correlations between the ...
0
votes
1answer
44 views

Model selection for and forecasting of arctic oscillation (a seasonal time series)

I'm having a doubt with a time series. I have to find the best model for it and use it to do some forecast. The data are about the arctic oscillation (AO) from 1950 to 2015. The series is clearly ...
0
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0answers
11 views

R darch : deep neural net pre-training

I'm trying to train a (not even deep) network on iris using the darch package. It works well as a standard backprop-net, but becomes bad as soon as I add a little pre-training: ...
0
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1answer
32 views

Alternative to beta regression

In the data that I am working on, my response is a proportion ranging between 0 and 1. I learnt that beta regression is probably the best choice to model such data, but is there a suitable alternative ...
0
votes
1answer
31 views

Metafor package in R: meta regression and scatter plot

I am doing a meta-regression with metafor package in R. The mixed-effect model for proportion is used to assess the linearity between study performed year and medication prevalence. Here below is my ...
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0answers
8 views

Add a legend on package darts [on hold]

I'm a student of statistic master degree of Padua. I'm finishing my thesi on models of darts. I've a speed question, Who Can help me? With this package you estimate the variance of dart's throw for ...
0
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0answers
10 views

Improve ctr for recommender system

I work in internet advertising company and the task is to increase ctr. I have different variables, such as amounts of clicks, user location, browser, os, his previous history etc. What are possible ...
2
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0answers
26 views

One to one exact matching in R [on hold]

I'm attempting one-to-one exact matching in R. That is, I have 60,000 treatment observations and 200,000 control observations but I only want 60,000 control observations and I want those to be matched ...
1
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1answer
17 views

Interpreting the residuals vs. fitted values plot for logit GLMM?

What I have is a generalized linear mixed model of the log OR of a rater (random effect) giving a response above a certain level on an ordinal scale, given a specification of what the rater was ...
0
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0answers
26 views

Conflict answers between SPSS and R Software [on hold]

I used R software (auto.arima function) in getting the best ARIMA model for my data. Then I used SPSS in getting the parameter estimates since there is no p-value ...
0
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0answers
19 views

Difference in randomForestSRC and randomForest package / increasing OOB-Error curve

Probably this is related to randomForest vs randomForestSRC discrepancies. When training this dataset it seems, that concerning the mean missclassification error less trees are better than more in ...
0
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0answers
11 views

Comparison between different models: hierarchical models and model with dummy

I have these three models: M0<-glm(y=="yes"~x+z+b+c+r+as.factor(w),family="binomial") 'logLik' -1147.734 (df=65) ...
0
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0answers
6 views

Predicted values poisson family using cv.glmnet

I am a little bit confuse with the values predicted when using cv.glmnet with poisson family. I am using this model because my response variable is counts, but when a use the function predict with s ...
0
votes
1answer
20 views

What does the error “pre.period must span at least 3 time points” in the CausalImpact R package mean?

I've been encountering the error "pre.period must span at least 3 time points" when using the package. Can someone help me understand why the package requires me to have at least 3 time points and ...
0
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0answers
6 views

TMLE for non-binary treatment A

I'm trying to deploy the TMLE approach (WAY) to a non-binary treatment indicator variable, aka I have one group that is not treated, one group with treatment A, another with treatment B and yet ...
0
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0answers
7 views

Creating a Bargraph with Error Bars [on hold]

I am novice programmer and am making an attempt to learn R. Below is the dataset I am working with: ...
1
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0answers
10 views

R package RMySQL installation returns a configuration failed error [on hold]

I am trying to install RMySQL package, but getting the following error message: ...
0
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0answers
18 views

Rolling estimate of Andrews.Chen, median unbiased estimator of an AR model in R? [migrated]

Given an AR(4) process, this can be rewritten in an ADF form as In order to estimate $\rho$, that in this case represents the sum of the autoregressive parameters, there is a procedure proposed by ...
0
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0answers
14 views

'arg' must be NULL or a character vector [on hold]

Good afternoon, I wonder if I can work despejandome a little doubt, I happen to have an application that allows you to upload .CSV files Shiny made in order to apply to the data loaded Rule Sturges ...
0
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0answers
16 views

Mixed model with clustered and repeated-measures data

I'm analysing the results of an experiment using a mixed model. Reaction times for each subject (40 male and 40 female) to 8 stimuli have been registered. The process has been repeated on the same ...
3
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0answers
22 views

What do my residuals say about my data?

I am new to R and I am trying to find a relationship between Wing length (mm) and Weight (g) of black-capped chickadees using a data set of over 4000 data points. I did a regression analysis and ...
-1
votes
1answer
30 views

Handling missing values in function `prewhiten` in R [on hold]

I am using function prewhiten from "TSA" package in R. I get an error about NA values, but I don't understand it, because I ...
0
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0answers
11 views

Mixed Effects Model R Help [on hold]

I am trying to formulate a mixed effects model in R in order to determine the repeatability of individual personality traits. I have 4 measurements for each individual and I measured 6 personality ...
1
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2answers
20 views

Interpreting accuracy results for an ARIMA model fit

I want to know how accurate one ARIMA model is for estimating a second time series. I've built the model: ...
0
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0answers
5 views

How is correlation between fixed intercept and fixed effect calculated in lmer of R, lme4?

When I fit any model in lmer(), summary identifies a correlation between fixed effect(s) and the (fixed) intercept. How should ...
-1
votes
1answer
37 views

Shows an error in R : “In library, there is no package called devtools” even though I have installed the package [on hold]

I installed R 3.2.3 and RStudio. I then proceeded to install the packages. The first package I tried to install was the "devtools" package. It popped up a message saying since lib is unspecified, ...
0
votes
2answers
36 views

Statistical test in R for count data

I am struggling with using the correct test for count data in r. The dataset I have is the number of nymphs produced by three aphid species on wheat. So this is count data with one response variable ...
0
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0answers
8 views

How to create a desktop application from RGtk2 user interface? [on hold]

I'm using RGtk2 to create a graphical user interface for my project. This GUI should be used by users who are not familiar with R; therefore, I need to make a ...
0
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0answers
14 views

Forest plot of multi-variate analysis with subgroups

I am trying to plot a multivariate analysis by subgroup. I have three subgroups: Experiment group "E", Active controls "A", and Passive controls "P" that have been measured (pre and post) on a number ...