Comments on: Transform Data to Normal Distribution in R https://www.datanovia.com/en/lessons/transform-data-to-normal-distribution-in-r/ Data Mining and Statistics for Decision Support Fri, 09 May 2025 07:41:56 +0000 hourly 1 https://wordpress.org/?v=6.8.2 By: Ana https://www.datanovia.com/en/lessons/transform-data-to-normal-distribution-in-r/#comment-29381 Fri, 09 May 2025 07:41:56 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10895#comment-29381 Hi, how can I cite this website? I used in my paper the square-root transformation for negative data (reflected) but can’t find anywhere else a source. Thank you

]]> By: swarup https://www.datanovia.com/en/lessons/transform-data-to-normal-distribution-in-r/#comment-29343 Sun, 02 Mar 2025 16:16:09 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10895#comment-29343 I am not able to install ggpubr package. please help me with this

]]> By: Kirsty Brown https://www.datanovia.com/en/lessons/transform-data-to-normal-distribution-in-r/#comment-29211 Fri, 19 Jul 2024 15:08:20 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10895#comment-29211 Hello Kassambara,

Thank you for this super helpful article,
At the end you mentioned that for ANOVA tests, violations of normality will not necessarily compromise validity; I was wondering if you were able to provide a reference for this? As it would help support my justification for not having to transform my non-normal data when I’m planning to perform an ANOVA.

Thank you!!

]]> By: Mario https://www.datanovia.com/en/lessons/transform-data-to-normal-distribution-in-r/#comment-21133 Mon, 12 Oct 2020 15:27:46 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10895#comment-21133 Hello!
Would you have an academic reference (book, journal article) referring to a transformation in the form of log10(max(x+1) – x)?
Any hint would be most appreciated. Thank you!
Sincerely,
Mario

]]> By: tester https://www.datanovia.com/en/lessons/transform-data-to-normal-distribution-in-r/#comment-19914 Wed, 27 May 2020 16:54:54 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10895#comment-19914 In reply to kassambara.

one more (typo) maybe?
at end of article, where it says:

df$PHYS <- log10(max(df$CONT+1) – df$CONT)

shouldn't say, instead ?:
df$PHYS <- log10(max(df$PHYS+1) – df$PHYS)

Then, the final:
skewness(df$PHYS, na.rm = TRUE)
will also have a different value.

Just asking…

]]> By: kassambara https://www.datanovia.com/en/lessons/transform-data-to-normal-distribution-in-r/#comment-19913 Wed, 27 May 2020 16:11:19 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10895#comment-19913 In reply to tester.

OK, great that it works!

]]> By: tester https://www.datanovia.com/en/lessons/transform-data-to-normal-distribution-in-r/#comment-19910 Wed, 27 May 2020 16:08:22 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10895#comment-19910 In reply to tester.

oops! (Mea Culpa)
I missed a step in your Tutorial.
Ok, continue with the wonderful, clear examples…

]]> By: tester https://www.datanovia.com/en/lessons/transform-data-to-normal-distribution-in-r/#comment-19909 Wed, 27 May 2020 15:58:39 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10895#comment-19909 Hi Kassambara,
another EXCELLENT, clear article.

But getting an error message from example:
# Distribution of CONT variable
ggdensity(df, x = “CONT”, fill = “lightgray”, title = “CONT”) +
scale_x_continuous(limits = c(3, 12)) +
stat_overlay_normal_density(color = “red”, linetype = “dashed”)
#returns error:
Error in data[, x] : object of type ‘closure’ is not subsettable

help!

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