Questions tagged [r]

R is a free, open-source programming language and software environment for statistical computing, bioinformatics, and graphics.

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4 views

LSTM Cross Validation with Rolling Window

I'm stuck in coding a cross-validation technique for my LSTM RNN. My supervisor advised me to go with a rolling window cross-validation. My goal is to compare the RMSE for same day predictions. I am ...
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1answer
6 views

How Retail Analytics Project Can Be Done?

I have a project and I couldn't understand what I have to do because I am new with retail analytics. They said "Our goal is to measure the effects of promotion on sales" and "Your goal is to model ...
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1answer
17 views

Median of a list of frequencies

I have a list of groups and the frequencies of every group. E.g. ...
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0answers
8 views

Further analysis after topic identificatio

Using lda to find topics ...
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1answer
20 views

Which are the appropriate prameters for lda modeling?

I try to implement in R test for appropriate metrics for lda. Here the way I try to use LDA ...
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1answer
14 views

Conditional Function in R [on hold]

I have an R function for (i in 1:10) that reads in data and performs some cleaning. Is it possible to write a flexible statement to execute certain parts of the ...
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1answer
25 views

Measure degree of heteroscedasticity [on hold]

I analyzed my time series using Breusch Pagan test and observed the presence of heteroscedasticity in it. After box-cox transformation, I again tested the time series using Breusch Pagan test. The ...
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0answers
18 views

Save xboost model from R as Python pickle

I trying save R model to pickle, but I getting error Evaluation error: Unable to convert R object to Python type. ...
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1answer
20 views

R package vs REST API

I have a logistic regression algorithm in R to predict irresponsible users. I need this to be as flexible as possible for any market. I would need to use the logistic regression algorithm to ...
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1answer
15 views

Error loading tidyverse in R Studio - No broom package

I'm getting numerous errors when trying to install packages, namely tidyverse and ggplot. The error is of the form are always in the form: ...
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0answers
11 views

about SVD and PCA

i want to know when should i use SVD and when should i use PCA or the different purpose of each ? also if i run SVD on a matrix and i made a scatter plot for the svd$d and i found for example the ...
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7 views

how use RBF for primal model of svm?

I know if we want to solve primal model of non-linear SVM, we have to generate new features. for example for kernel (1+xz)^2 for primal problem for any pair of features x1 and x2 we have to generate: ...
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1answer
35 views

How to execute a git project with different input data?

I would like to run this project and receive result from this project However I have problem to execute the step mailcorpus.json created by executing the sql script data/get_mail_corpus.sql on ...
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9 views

How to create a new dataframe by combining and summing columns in R [closed]

I have a dataset with year, season, and number of fish of different ages (age 2, 3, 4, 5). I would like to 1) create a new table which 2) sum the number of fish of each age for each year and season. ...
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1answer
23 views

Merging three different customer segmentation systems into one

I have been given a task where I have three existing customer segmentation systems (rule based e.g. if customer spends X in Y amount of time AND whatever then put in top spender segment is one segment,...
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2answers
35 views

Splitting training and test set with financial data

I am using trees algorithms (decision tree, random forest and XGBoost) to forecast the sign of the returns in the stock market (classification). I am using this article as a reference: http://...
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1answer
39 views

Reticulate vs Python

I have gotten very used to coding in R and especially in RStudio. I like that interface. Nonetheless, I have some work that I ought to do in Python. I know that I can run Python code in RStudio if I ...
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18 views

Interrater-reliability for several items at interval or ordinal scale with 2-3 different raters

I would like to compute the interrater-reliability in R for a sample (n=150) in which each individual was rated by 2 to 3 raters (in ca. 40% of the sample 2 raters, 60% 3 raters). Raters were ...
3
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1answer
66 views

What is Orange all about?

I read a lot about Orange here in the forum. I know that it is a Software developed at the University of Ljubljana. I guess it has some kind of GUI which makes it a „cheap and easy“ way to implement ...
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22 views

How to compare 2 elements of a column with each other?

I am using R. I have a column with 4 elements {car, bus, walk, train}. I would like to compare the car and bus with each other with the help of the 3 other columns. ...
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29 views

R SVM Predict - Error in predict.svm: test data does not match model

I started with a data frame of 23,515 rows and 3 columns. I split the data 70/30 into training/testing. I am fitting a classification model with SVM from the e1071 package to predict variable MISSING. ...
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1answer
25 views

How to interpret two continous variables output using GAM?

I am sort of new in R and learning day by day. I really need help with GAM. I have to find out whether association is linear or non-linear by using GAM. The predictor variable is temperature at lag0 ...
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1answer
22 views

How to find what events cluster together?

I have a data set that looks at a five-year timespan of peoples' lives and indicates if specific events have occurred (Divorce, Birth of Child, Health Shock, etc.). ...
1
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1answer
25 views

About Hadley Wickham paper on tidy data

I read this paper and understood it very well, but I miss negative impact that will happen if we don’t fix the 5 types of messy data introduced in the paper (page 5), or even how fixing them will make ...
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0answers
21 views

Need Help in modeling sequence prediction problem

I am working on a problem where I have a dataset with 50 predictors (all numeric) and one response variable which is a string of words. ...
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0answers
12 views

Is it possible to create nonbinary trees in XGBoost?

I'm looking through the documentation for XGBoost, and I'm not seeing any parameters relating to number of branches per node.
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0answers
8 views

fit grouped data but continue when it fails for a single instance

I want to perform a nls() model on grouped data, let's say sensor1 to sensor100. Sometimes, ...
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0answers
19 views

R: Difference in understanding of likelihood and Goodness-of-fit statistics

I am trying to fit normal distribution to my data using fitdist. The log likelihood of fit comes out to be -2788549. Since log likelihood is negative it means likelihood value lies in 0 and 1 which ...
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0answers
10 views

Prepping data for association rules mining

I have access to transactional data from an pharmacy claims database. I can easily create the data in the typical format that is a column for transaction id and a separate column for product i.e. <...
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0answers
47 views

Handling different length string features and prediction of these based on other features

I am currently working on a problem where the dataset contains 200+ features (Let's call them the code features, e.g no.of.loops, memoryInst, loadInst, etc and Flags that are used to compile code ...
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17 views

R: analysis of conditional heteroscedasticity using McLeod Li test

I am using R for McLeod Li test for conditional heteroscedasticity on time series before and after boxcox transformation. The null hypothesis for this test is of no heteroscedasticity. I observed that ...
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0answers
7 views

R: Error using Shapiro Wilk test for multivariate normality

I want to test if my data is multivariate normal. For this, I am using mvnnormtest package and Shapiro-Wilk multivariate normality test. I am passing the data to function as: ...
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0answers
7 views

R: Breusch-pagan test heteroscedasticity before and after boxcox transformation

I am trying breusch-pagan on a a feature regressed using multiple variables as: bptest(lm(V1~V2+V3+V4+V5+V6+V7+V8+V9+V10+V11+V12+V13+V14,data=data)) It shows BP ...
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1answer
10 views

R: Breush-pagan test for complete dataset [on hold]

I am trying breush-pagan test for testing heteroscedasticity in timeseries of 10 features using R package lmtest. This package lets you test heteroscedasticity in two variables of which one is ...
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0answers
36 views

Different approaches for categorical non-ordered data clustering in R

I'm trying to find different clustering approaches for only categorical data in R, so far I found: klaR for kmode cba for rock Hierarchical clustering (agglomerative or divisive) with a categorical ...
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0answers
7 views

Analysis on the 5 segment of the data to differentiate from each other using R

I have 1000 customers operational data which is already divided into segments. Now I have to do analysis on different segments to find out how they differ from each other. Why they fall into their ...
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9 views

How to use interaction variables and indicator variable with GBM model in R?

I am new to Machine Learning and i have been working on a classification model which predicts donor is available or not. There is a variable which specifies whether user registered online voluntarily ...
2
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1answer
50 views

When I should use PCA?

I have a data set with 60000 rows and 32 columns. I want to use SVM (with some more constraints that make it more complicated)and I think 32 columns are too large. So I decided to use PCA. But when I ...
-1
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1answer
38 views

How to interpret this summary output in R?

How Do I interpret this summary output in R? Coefficients: ...
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1answer
15 views

Sample Space of Longest Run

I am trying to find a way to calculate all possible combinations of a sequence that have a certain length of long run. When answering questions regarding sequences of heads and tails, sometimes ...
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0answers
13 views

A way to identify anomalous trends amongst several trends?

I'm working on a personal project, where I'd like to identify anomalous trends. Here's the scenario: Imagine a company can sell 3 types of say, candies: X, Y, and Z. For some reason, these prices can ...
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0answers
12 views

how should i check stability of community detection algorithm?

I have a community detection algorithm that communities can't have overlap. It works based on density of edges. Now I want to see how stable this algorithm is (if I decrease internal edges and ...
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0answers
9 views

ARCH and GARCH model working and R code for its implementation

my time series data set doesn't have a proper trend or seasonality. Heard about ARCH and GARCH model which works fine on Un-trended data set but I am not finding the proper R code for its ...
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0answers
15 views

Create 'All' categories and summarize

I have a dataframe with columns as defined below. For each of these variables ...
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0answers
28 views

Sum only unique value by group

That's the structur of my data set ...
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2answers
61 views

Help on Looping in R

I am trying to build a for loop in R. but facing the error as the loop is not creating the exact variable and may be double counting. What i trying to do is The code has to go through every row and ...
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0answers
28 views

How to add weight to a variable to a ensemble method

I am building an ensemble method and would like to add weight to one particular variable (x3 in this case). How can I do this? Here is my code: ...
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2answers
39 views

Why does changing the cluster number change the plot in Kmeans?

This might be a dumb questions but I can't find the answer to it. I don't have the perfect mathematical understanding of kmeans, so apologies if it is. I'm just wondering why I see a different plot ...
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0answers
28 views

Transformation of matrix with missing values for hierarchical clustering

Comparing different variables, I got a matrix with lots of missing values. How do I have to transform the matrix below for hierarchical clustering? What I have already tried: ...
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1answer
25 views

How to transform many columns of TRUE/FALSE/NA to just TRUE/FALSE?

I have a dataframe that consists of a few columns of text, and then a bunch of columns that are TRUE/FALSE or NA (they were TRUE/FALSE but I left-joined them with ...