Most voted questions in Data Science

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Creating an R dataframe row-by-row

In RStudio, if I execute this code: "1 ...READ MORE

Jul 5, 2022 in Data Science by avinash
 • 1,840 points • 427 views
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R console output only shows most recent command in "if" condition

In RStudio, if I execute this code: "1 ...READ MORE

Jul 5, 2022 in Data Science by avinash
 • 1,840 points • 357 views
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Getting "NA" when I run a standard deviation

a quick query I read the variable ...READ MORE

Jul 5, 2022 in Data Science by avinash
 • 1,840 points • 685 views
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Get row and column indices of matches using `which()`

Say I have some matrix, for example: m ...READ MORE

Jul 5, 2022 in Data Science by avinash
 • 1,840 points • 416 views
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Get row and column indices of matches using `which()`

Say I have some matrix, for example: m ...READ MORE

Jul 5, 2022 in Data Science by avinash
 • 1,840 points
edited Mar 4 • 40 views
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Why 'nrow()' function doesn't seem to work within 'summarise()' function?

See the code below: library(dslabs) \sdata(gapminder) gapminder percent > ...READ MORE

Jun 30, 2022 in Data Science by avinash
 • 1,840 points • 417 views
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Standard Deviation in R Seems to be Returning the Wrong Answer - Am I Doing Something Wrong?

An easy illustration of standard deviation calculation: The ...READ MORE

Jun 30, 2022 in Data Science by avinash
 • 1,840 points • 590 views
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Load csv file in R

Is it possible to import a csv ...READ MORE

Jun 27, 2022 in Data Science by avinash
 • 1,840 points • 401 views
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Stepwise AIC using forward selection in R

In R, I'm attempting to perform a ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 530 views
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To speed up the tapply function in R, or another function to convert data frame into a matrix

I must turn a sizable dataset into ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 452 views
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understanding durbin-watson test in R

I believe I have a misconception about ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 756 views
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Calculate correlation with cor(), only for numerical columns

I have a dataframe and would like ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 534 views
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Create a sequence of sequences of numbers

The following sequence should be created in ...READ MORE

Jun 24, 2022 in Data Science by Avinash
 • 1,260 points • 498 views
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1 answer

Unexpected behavior for setdiff() function in R

Asymmetric difference is provided by 18 setdiff. ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 1,212 views
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1 answer

grepl in R to find matches to any of a list of character strings

Inside of a grepl regular expression, you ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 3,574 views
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1 answer

What's the difference between "*" and "+" in lm() in R?

Lm is a fitting method for linear ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 1,310 views
0 votes
1 answer

Using dcast to widen a data frame

> dcast(z, id ~ item, value.var="freq") ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 580 views
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1 answer

Import CSV file using R

If there are quotes ("), by using ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 1,346 views
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1 answer

Problem with sample function in R

The first time works, but after that, ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 640 views
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1 answer

How to implement Knn-algorithm without using k-nn function in r?

I created an example that demonstrates the ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 613 views
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1 answer

unique() for more than one variable

df <- data.frame(yad = c("BARBIE", "BARBIE", "BAKUGAN", ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 423 views
0 votes
1 answer

What does |> (pipe greater than) mean in R?

The "pipe" operator in R is |>. ...READ MORE

Jun 14, 2022 in Data Science by Sohail
 • 3,040 points • 2,034 views
0 votes
1 answer

The difference between Map() and map () from Purrr package in R

The tilde just indicates to the map ...READ MORE

Jun 14, 2022 in Data Science by Sohail
 • 3,040 points • 610 views
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1 answer

Filter multiple values on a string column in dplyr

The filter() function is used to select ...READ MORE

Jun 14, 2022 in Data Science by Sohail
 • 3,040 points • 1,180 views
0 votes
1 answer

Changing column names of a data frame

import pandas as pd #define DataFrame df = pd.DataFrame({'team':['A', ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 665 views
0 votes
1 answer

How to join (merge) data frames (inner, outer, left, right)

The merge function and its optional parameters ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 586 views
0 votes
1 answer

How to overlay density plots in R?

The second one has 104 usage lines: plot(density(MyData$Column1)) ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 1,162 views
0 votes
1 answer

rnorm function in R - Usage

y = rnorm(12, rep(c(1,2,1), each=4, 0.2)) I can ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 906 views
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how to make 2 separate substrings from strsplit in R

When it comes to accessing the elements ...READ MORE

Jun 13, 2022 in Data Science by Avinash
 • 1,260 points • 412 views
0 votes
1 answer

Add two lines on graph using abline in R

I am using "y 0+x" to fit ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 739 views
0 votes
1 answer

Why is it not advisable to use attach() in R, and what should I use instead?

There is one more option that applies ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 613 views
0 votes
1 answer

How To Create Vector of Vector In R

Create a list: List() on x returns x[[1]] ...READ MORE

Jun 24, 2022 in Data Science by Sohail
 • 3,040 points • 599 views
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Why I cannot save mutate result in r?

This should be a straightforward question. Within ...READ MORE

Jun 10, 2022 in Data Science by Avinash
 • 1,260 points
edited Mar 4 • 33 views
0 votes
1 answer

plotting in different shapes using pch= argument

plot(Sepal.Length ~ Petal.Length, ...READ MORE

Jun 23, 2022 in Data Science by Sohail
 • 3,040 points • 613 views
0 votes
1 answer

Creating new Functions with Linear Regression in R :

When we want to create a model ...READ MORE

Jun 1, 2022 in Data Science by Sohail
 • 3,040 points • 680 views
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1 answer

R cbind with get paste

This is how we use column names x ...READ MORE

Jun 1, 2022 in Data Science by Sohail
 • 3,040 points • 965 views
0 votes
1 answer

What does c do in R?

The c function in R programming usually stands ...READ MORE

Jun 1, 2022 in Data Science by Sohail
 • 3,040 points
edited Nov 28, 2023 by Soumya • 25,742 views
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1 answer

do-while loop in R

Unlike for and while loops, which test the loop condition at ...READ MORE

Jun 1, 2022 in Data Science by Sohail
 • 3,040 points • 797 views
0 votes
1 answer

R package dplyr reinstall every instance

In R, there are two steps of ...READ MORE

Jun 1, 2022 in Data Science by Sohail
 • 3,040 points • 747 views
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1 answer

Reasons for using the set.seed function

The requirement is a desire for repeatable ...READ MORE

Jun 20, 2022 in Data Science by Sohail
 • 3,040 points • 511 views
0 votes
1 answer

How to make loop for one-at-a time logistic regression in R?

You're probably looking for something similar to ...READ MORE

Jun 20, 2022 in Data Science by Sohail
 • 3,040 points • 1,201 views
0 votes
1 answer

Difference between the == and %in% operators in R

According to help('percent in percent'), percent in ...READ MORE

Jun 23, 2022 in Data Science by Sohail
 • 3,040 points • 622 views
0 votes
1 answer

Difference between the == and %in% operators in R

percent in percent "returns a vector of ...READ MORE

Jun 20, 2022 in Data Science by Sohail
 • 3,040 points • 881 views
0 votes
1 answer

Test if a vector contains a given element

1. Making use of the std::count function Counting ...READ MORE

Jun 20, 2022 in Data Science by Sohail
 • 3,040 points • 623 views
0 votes
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Determine the data types of a data frame's columns

I'm using R and have loaded data ...READ MORE

Jun 1, 2022 in Data Science by avinash
 • 1,840 points • 505 views
0 votes
0 answers

Introduction to Statistical Learning with Applications in R Figure Codes

I recently bought the following book: An Introduction ...READ MORE

Jun 1, 2022 in Data Science by avinash
 • 1,840 points • 669 views
0 votes
0 answers

How do I prepare different .txt files to analyse and compare the language used in texts ( i.e. sentences and paragraphs) in RStudio?

Hi, I am quite new to using ...READ MORE

May 19, 2022 in Data Science by KARIEN
edited Mar 4 • 121 views
0 votes
0 answers

Hi, I am trying Random Forest on data. when I am fitting "rfr.fit(x_train,y_train)" its giving below error.

ValueError: Expected 2D array, got 1D array ...READ MORE

May 16, 2022 in Data Science by Naresh
edited Mar 4 • 59 views
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0 answers

Provide solution for this message on jupyter-IndentationError: expected an indented block

please tell me the indentation error  in ...READ MORE

May 15, 2022 in Data Science by Arushi
edited Mar 4 • 133 views
0 votes
1 answer

Converting xlsx to xls using Microsoft Office Compitablity Pack's excelcnv

Simply rearranging the positions of the parameters ...READ MORE

Mar 25, 2022 in Data Science by gaurav
 • 23,260 points • 1,601 views
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