Most voted questions in Data Analytics

+1 vote
1 answer

Getting the following error: Error in eval

This error is caused by references to ...READ MORE

Oct 31, 2018 in Data Analytics by Kalgi
• 52,360 points
536 views
+1 vote
1 answer

Remove NA values from the output in R programming

Edit your code: columnmean <- function(x, removeNA = ...READ MORE

Oct 31, 2018 in Data Analytics by Kalgi
• 52,360 points
640 views
+1 vote
1 answer

R has something called lazy evaluation, what does that mean?

Let me explain this with an example. ...READ MORE

Oct 31, 2018 in Data Analytics by Kalgi
• 52,360 points
995 views
+1 vote
1 answer

ROC curve use

ROC curve is basically used to reflect ...READ MORE

Oct 30, 2018 in Data Analytics by kurt_cobain
• 9,390 points
617 views
+1 vote
1 answer

k means vs KNN

K-means clustering is basically an unsupervised clustering ...READ MORE

Oct 30, 2018 in Data Analytics by kurt_cobain
• 9,390 points
797 views
+1 vote
1 answer

Does R programming support Firebird database?

Yes ofcourse you can.  This page will show ...READ MORE

Oct 30, 2018 in Data Analytics by Maverick
• 10,840 points
1,331 views
+1 vote
1 answer

Sklearn GaussianMixture

The GaussianMixture object implements the expectation-maximization (EM) ...READ MORE

Oct 30, 2018 in Data Analytics by Priyaj
• 58,090 points
766 views
+1 vote
1 answer

"Error in eval(ei, envir) : object 'RDX2' not found" when trying to source the code in R

This is a very common issue that ...READ MORE

Oct 30, 2018 in Data Analytics by Maverick
• 10,840 points
4,661 views
+1 vote
1 answer

Difference between factor and as.factor in R programming

Hey @Ali, as.factor is a wrapper for ...READ MORE

Oct 29, 2018 in Data Analytics by Maverick
• 10,840 points
4,491 views
+1 vote
1 answer

R programming Web Scraping

Try something like this: library(rvest) library(rvest) library(tidyverse) urls <- read_html("http://dk.farnell.com/c/office-computer-networking-products/prl/results/") pag <- ...READ MORE

Oct 29, 2018 in Data Analytics by Maverick
• 10,840 points
781 views
+1 vote
1 answer

What does “Error: object '<myvariable>' not found” mean?

The error means that R could not ...READ MORE

Oct 29, 2018 in Data Analytics by Ali
• 11,360 points
1,781 views
+1 vote
3 answers

Which language should I learn when starting career as data scientist - R or Python

I'll put down a few parameters on ...READ MORE

Oct 26, 2018 in Data Analytics by Kalgi
• 52,360 points
983 views
+1 vote
2 answers
+1 vote
1 answer

How can I use which() function in R ?

which() function determines the position of elements ...READ MORE

Sep 25, 2018 in Data Analytics by Daisy
• 8,120 points
7,221 views
+1 vote
3 answers

What is logistic regression?

Logistic regression is analysis to conduct when ...READ MORE

Aug 7, 2019 in Data Analytics by anonymous
1,480 views
+1 vote
3 answers

%>% What are these symbols/characters used for in R?

%>% is called a pipe. The process ...READ MORE

Aug 7, 2019 in Data Analytics by anonymous
755 views
+1 vote
2 answers

What is an RDBMS? Name some examples for RDBMS? What is CRUD?

RDBMS: Relational Database Management System A relational database ...READ MORE

Aug 29, 2018 in Data Analytics by zombie
• 3,790 points
27,473 views
+1 vote
2 answers

avoid producing a eps-graphic with 2 pages by mixing traditional and grid graphics

The bv_set() is missing from your code hence ...READ MORE

Aug 28, 2018 in Data Analytics by Anmol
• 1,780 points
567 views
+1 vote
4 answers

Python vs. R for data science

I would say both Python and R ...READ MORE

Aug 1, 2019 in Data Analytics by briny
1,492 views
+1 vote
2 answers

How can I get experience in Data Science as a fresher?

Work on projects of your own. It’s tough, ...READ MORE

Aug 9, 2018 in Data Analytics by Abhi
• 3,720 points
568 views
+1 vote
1 answer

How good at SQL does a data scientist really need to be?

SQL is a standardized query language for requesting information ...READ MORE

Aug 9, 2018 in Data Analytics by Abhi
• 3,720 points
420 views
+1 vote
2 answers

What is the difference between LDA and PCA for dimensionality reduction?

Principal Component Analysis (PCA) is an unsupervised ...READ MORE

Mar 7, 2019 in Data Analytics by Seema
• 140 points
14,277 views
+1 vote
1 answer

How do I perform feature selection in a disease prediction data set?

Feature selection is based equally upon logic ...READ MORE

Aug 20, 2018 in Data Analytics by Abhi
• 3,720 points
631 views
+1 vote
3 answers

Number of missing values in dataset

Try this, lapply(airquality, function(x) { sum(is.na(x)) }) READ MORE

Aug 7, 2019 in Data Analytics by anonymous
3,836 views
+1 vote
2 answers

What is the difference between correlation and covariance?

Correlation and Co-variance both are used as ...READ MORE

Jul 24, 2018 in Data Analytics by Abhi
• 3,720 points
3,715 views
+1 vote
2 answers

Different data structures in R

The different data types in R are ...READ MORE

Aug 26, 2019 in Data Analytics by anonymous
• 33,030 points
1,138 views
+1 vote
1 answer

Difference between validation set and a test set

Validation set can be considered as a part ...READ MORE

Jul 24, 2018 in Data Analytics by CodingByHeart77
• 3,740 points
990 views
+1 vote
1 answer

How to handle Nominal Data?

Nominal data is basically data which can ...READ MORE

Jul 24, 2018 in Data Analytics by Abhi
• 3,720 points
460 views
+1 vote
1 answer

Identify object in R

Hi,  You can use ? followed by the ...READ MORE

Jul 2, 2019 in Data Analytics by anonymous
• 33,030 points
428 views
+1 vote
2 answers

How to replace a value in a data frame based on a conditional 'If' statement?

It's easier to convert alpha to characters ...READ MORE

Jun 6, 2018 in Data Analytics by Sahiti
• 6,370 points
36,268 views
+1 vote
1 answer

Binding rows of 2 data-frames which have non-identical columns

You can use the smartbind() function from ...READ MORE

May 22, 2018 in Data Analytics by Bharani
• 4,660 points
5,798 views
+1 vote
2 answers

Locating row index of a column which has the maximum value - R

Hi, Nirvana You can also try this. which(iris$Sepal.Length == ...READ MORE

Aug 21, 2019 in Data Analytics by anonymous
• 33,030 points
12,643 views
+1 vote
1 answer

How to extract every nth element of a vector using R?

m <- 1:50 n<- m[seq(1, length(m), 6)] The above ...READ MORE

May 14, 2018 in Data Analytics by zombie
• 3,790 points
27,660 views
+1 vote
1 answer

How to change fill color in each facet using ggplot2?

You can map the facetting variable to ...READ MORE

May 8, 2018 in Data Analytics by kappa3010
• 2,090 points
24,620 views
+1 vote
2 answers

Splitting the data into training and testing sets - R

Hi, Try like this. train = sample(x = ...READ MORE

Aug 21, 2019 in Data Analytics by anonymous
• 33,030 points
5,695 views
+1 vote
2 answers

How can we count TRUE values in a logical vector?

Hi, You can get a count of all ...READ MORE

Aug 21, 2019 in Data Analytics by anonymous
• 33,030 points
9,722 views
+1 vote
2 answers

Which function can I use to clear the console in R and RStudio ?

Description                   Windows & Linux           Mac Clear console                      Ctrl+L ...READ MORE

Apr 17, 2018 in Data Analytics by anonymous
74,155 views
+1 vote
2 answers

How can I drop columns by name in a data frame ?

We can Drop Columns by name in ...READ MORE

Apr 14, 2018 in Data Analytics by zombie
• 3,790 points
28,053 views
+1 vote
1 answer

How to convert a list of dataframes in to a single dataframe using R?

You can use the plyr function: data <- ...READ MORE

Apr 14, 2018 in Data Analytics by Sahiti
• 6,370 points
6,282 views
+1 vote
1 answer

How to convert dataframe columns from factors to characters?

To replace all the variables to character ...READ MORE

Apr 13, 2018 in Data Analytics by BHARANI
• 420 points
19,212 views
+1 vote
2 answers

How to count the number of elements with the values in a vector?

Use dplyr function group_by(). > n = as.data.frame(num) > ...READ MORE

Aug 21, 2019 in Data Analytics by anonymous
• 33,030 points
4,546 views
+1 vote
3 answers

How to change column names of a Data frame?

Hi, To change the name of a column ...READ MORE

Oct 30, 2020 in Data Analytics by MD
• 95,440 points
1,352 views
+1 vote
2 answers

How to sort a data frame by columns in R?

You can use dplyr function arrange() like ...READ MORE

Aug 21, 2019 in Data Analytics by anonymous
• 33,030 points
1,416 views
+1 vote
1 answer

How to convert a list of vectors with various length into a Data.Frame?

We can easily use this command as.data.frame(lapply(d1, "length< ...READ MORE

Apr 4, 2018 in Data Analytics by DeepCoder786
• 1,720 points
1,241 views
+1 vote
2 answers

Finding number of missing values and removing those missing values from a data-frame

To find number of missing values for ...READ MORE

Aug 14, 2019 in Data Analytics by anonymous
852 views
+1 vote
2 answers

Custom Function to replace missing values in a vector with the mean of values

Try this. lapply(a,function(x){ifelse(is.na(x),mean(a,na.rm = TRUE ...READ MORE

Aug 14, 2019 in Data Analytics by anonymous
1,616 views
+1 vote
3 answers

Filtering R data-frame with multiple conditions

You can use the 'filter' function from ...READ MORE

Mar 26, 2018 in Data Analytics by Bharani
• 4,660 points
86,461 views
+1 vote
3 answers

Integration of Google Collaboratory with github

You can use SSH protocol to connect ...READ MORE

Aug 7, 2018 in Data Analytics by Kalgi
• 52,360 points
2,764 views
+1 vote
1 answer

Hadoop Mapreduce word count Program

Firstly you need to understand the concept ...READ MORE

Mar 16, 2018 in Data Analytics by nitinrawat895
• 11,380 points
10,556 views
+1 vote
1 answer

Join using two mappers - invalid inputfile exception

Dear Learner, Hope you are doing well. Can you ...READ MORE

Dec 18, 2017 in Data Analytics by Sudhir
• 1,610 points
429 views