Dear All,
I have several charts with ~ 15 columns in each.
In the analysis of significance, how do we group these columns in letter-based style (a, ab, b, c, cd, d ... etc)?.. Is there any easy software to use?
Many thanks!
Maybe you can apply some multivariate techniques, such as K-means Cluster Analysis, which help you to group your data according their similarity.
Those letters are often called a compact letter display.
You start with a test that compares the treatments and reports p-values. Usually the test will compare each treatment to each other treatment. As examples, Tukey HSD or Dunn test could be used.
From there, you assign the letters so that any two treatments sharing a letter are not significantly different. This can be done by hand, although in some cases this can get tricky.
As a software solution, the cldList function in the rcompanion package † in R can be used.
In the following example, there are three treatments and three total comparisons. A test such as Tukey or Dunn had been run earlier to determine the p-values.
if(!require(rcompanion)){install.packages("rcompanion")}
Example = read.table(header=T, text="
Comparison p-value
'I - II ' 0.60
'I - III' 0.02
'II - III' 0.60
")
library(rcompanion)
cldList(p-value ~ Comparison, data = Example)
# Group Letter MonoLetter
# 1 I a a
# 2 II ab ab
# 3 III b b
_________________________
† Disclosure: I am the author of this package.
Dear Mazen
You can use SPSS software to analysis your data, it is easy software and needs little training.
Good Luck
#USING R STUDIO THIS CAN BE ACHIEVED WITH THE PACKAGE AGRICOLAE
##call the packages
library("agricolae")
library("data.table")
library("ggplot2")
library("ggpubr")
library("plyr")
library("dplyr")
library("tidyr")
library("tidyverse")
##Import your long format data
data % as_tibble(rownames="model")
##use the function below to reorder the ANOVA output such that the smallest mean is assigned the letter a and so forth for the next means
reorder
I agree with Dennis Ochola . You can use 'Agricolae' in R programming. Just a small code will give the 'alphabets' for statistical difference.
Thank you every one for your answers
I used a software named Co-Stat which helped analyze my data that I published in this journal
Article Effects of Abscisic Acid and Salicylic Acid on Gene Expressi...
It took me few hours to finish all the analyses.
I highly recommend it.
Dear Mazen,
Hope you are doing very well!
I used STAT-ITCF statistical programme (2ndVersion) based on Newman-Keuls test for detecting differences among means of subgrups (Anonymous, 1988).
All the best
Jawhar
@Mohammed Jawhar
Thank you very much for your reply and I hope you and all colleagues are doing very well at aec, especially Dr. Araabi.
In fact I solve the problem a while ago with a software called co-stat, I highly appreciate your help and my advice to have a look on that software I used cuz it's also convenient and windows friendly application.
Best from Korea
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