Unanswered questions in Data Science

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Using group by on multiple columns

I recognize the purpose of GROUP BY ...READ MORE

Sep 2, 2022 in Data Science by Kithuzzz
 • 29,080 points • 94 views
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Finding duplicate rows in SQL Server

I have a SQL Server data set ...READ MORE

Aug 13, 2022 in Data Science by Kithuzzz
 • 29,080 points • 98 views
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What does R assume regarding order in paired t-test?

I'm assuming that the data are assumed ...READ MORE

Jul 22, 2022 in Data Science by avinash
 • 1,840 points • 85 views
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How to read a csv-file from an url in R?

I'm not very experienced with R, so ...READ MORE

Jul 22, 2022 in Data Science by avinash
 • 1,840 points • 154 views
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R: Generate Random Numbers with "floor" and "runif"

The R programming language is what I'm ...READ MORE

Jul 22, 2022 in Data Science by avinash
 • 1,840 points • 158 views
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How to plot two histograms together in R?

I have two data frames, one each ...READ MORE

Jul 22, 2022 in Data Science by avinash
 • 1,840 points • 94 views
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The difference of na.rm and na.omit in R

I've just started with R and I've ...READ MORE

Jul 22, 2022 in Data Science by avinash
 • 1,840 points • 121 views
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Forecast Package from R in Python

The greatest tool for time series analysis ...READ MORE

Jul 22, 2022 in Data Science by avinash
 • 1,840 points • 141 views
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Data frames and is.nan()

I was using sum(is.na(my.df)) to check whether ...READ MORE

Jul 22, 2022 in Data Science by avinash
 • 1,840 points • 51 views
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Data frames and is.nan()

Sum(is.na(my.df)) worked as predicted when I used ...READ MORE

Jul 20, 2022 in Data Science by avinash
 • 1,840 points • 49 views
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Understanding of minbucket function in CART model using R

Let's say that the training data is ...READ MORE

Jul 20, 2022 in Data Science by avinash
 • 1,840 points • 73 views
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How to use plotly in R shiny

I'm attempting to add a graph to ...READ MORE

Jul 20, 2022 in Data Science by avinash
 • 1,840 points • 66 views
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Plot a legend outside of the plotting area in base graphics?

I've only recently started using RStudio to ...READ MORE

Jul 20, 2022 in Data Science by avinash
 • 1,840 points • 51 views
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sample function in R

I've only recently started using RStudio to ...READ MORE

Jul 20, 2022 in Data Science by avinash
 • 1,840 points • 52 views
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R command for setting working directory to source file location in Rstudio

I am working out some tutorials in ...READ MORE

Jul 20, 2022 in Data Science by avinash
 • 1,840 points • 67 views
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How to deal with NaN values in R?

Due of my inexperience with programming and ...READ MORE

Jul 9, 2022 in Data Science by avinash
 • 1,840 points • 68 views
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Difference between ls() and objects()

What distinguishes the ls() and objects() functions? The ...READ MORE

Jul 9, 2022 in Data Science by avinash
 • 1,840 points • 63 views
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passing function argument to dplyr select

I can do this to pick out ...READ MORE

Jul 9, 2022 in Data Science by avinash
 • 1,840 points • 79 views
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Frequency table in R

I'm having trouble with something that ought ...READ MORE

Jul 9, 2022 in Data Science by avinash
 • 1,840 points • 74 views
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NA while using strptime function

Version 1.0.136 of R Studio for Windows ...READ MORE

Jul 9, 2022 in Data Science by avinash
 • 1,840 points • 77 views
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Read an Excel file directly from a R script

How do I open an Excel file ...READ MORE

Jul 9, 2022 in Data Science by avinash
 • 1,840 points • 48 views
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How does cut with breaks work in R

I've tried using?cut but haven't been able ...READ MORE

Jul 9, 2022 in Data Science by avinash
 • 1,840 points • 71 views
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How does cut with breaks work in R

I've tried using?cut but haven't been able ...READ MORE

Jul 6, 2022 in Data Science by avinash
 • 1,840 points • 57 views
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Explicitly calling return in a function or not

A while back, Simon Urbanek from the ...READ MORE

Jul 6, 2022 in Data Science by avinash
 • 1,840 points • 50 views
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Understanding `scale` in R

I'm attempting to comprehend R's definition of ...READ MORE

Jul 6, 2022 in Data Science by avinash
 • 1,840 points • 53 views
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What is the difference between rm() and rm(list=ls())?

The majority of items I've read. They ...READ MORE

Jul 5, 2022 in Data Science by avinash
 • 1,840 points • 121 views
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Fibonacci Sequence in R

Due of my inexperience with programming and ...READ MORE

Jul 5, 2022 in Data Science by avinash
 • 1,840 points • 85 views
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How do I get a list of built-in data sets in R?

Please advise on how to obtain the ...READ MORE

Jul 5, 2022 in Data Science by avinash
 • 1,840 points • 58 views
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How to manually find the minors of a matrix in R programming?

I have to write a function that ...READ MORE

Jul 5, 2022 in Data Science by avinash
 • 1,840 points • 128 views
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In R, how to get an object's name after it is sent to a function?

I'm trying to find the opposite of ...READ MORE

Jul 5, 2022 in Data Science by avinash
 • 1,840 points • 52 views
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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 • 61 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 • 48 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 • 112 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 • 57 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 • 69 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 • 76 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 • 73 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
 • 2,960 points • 81 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
 • 2,960 points • 68 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
 • 2,960 points • 70 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
 • 2,960 points • 83 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 • 54 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 • 61 views
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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 • 64 views
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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 • 158 views

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