July 10, 2024

Chris Evans

graphics

R graphics

R markdown

R tricks

I think this is a bug, others disagree!

June 26, 2024

Chris Evans

Psychometrics

Correlation

Transformations

Standardising

This explains why this transform can be misleading.

April 20, 2024

Chris Evans

Psychometrics

Correlation

n=1

This expands the glossary entry about convergent validity

March 11, 2024

Chris Evans

R tricks

Distributions

Gaussian distribution

Post that will link closely to glossary entries and shiny apps all about dispersion, scatter, variance

Feb. 17, 2024

Chris Evans

Geeky stuff

Anonymising Libre/OpenOffice ODT and M$oft Wurd DOCX documents

Jan. 21, 2024

Chris Evans

RCSC paradigm

CECPfuns package

CSC matching lookup with lookupCSCgenderAndAge()

Jan. 19, 2024

Chris Evans

Effect sizes

A bit about Hedges's g!

Jan. 3, 2024

Chris Evans

Correlation

Null hypothesis tests (NHSTs)

Significance testing and confidence intervals for correlation coefficients ... and back to why!

Dec. 30, 2023

Chris Evans

Correlation

Null hypothesis tests (NHSTs)

Exploration of the differences between different correlation coefficients.

Dec. 23, 2023

Chris Evans

Multiple tests problem

Simulation

Null hypothesis tests (NHSTs)

A simple explanation of the Bonferroni correction for the multiple tests problem.

Nov. 27, 2023

Chris Evans

CECPfuns package

Correlation

Confidence intervals

Non-parametric statistics

Rank methods

Explores four methods of estimating a CI around an observed Spearman correlation.

Nov. 18, 2023

Chris Evans

R tricks

R graphics

Distributions

Null hypothesis tests (NHSTs)

Gaussian distribution

Plots and graphs

Graphical exploration of fit between distributions and against theoretical distributions.

Nov. 15, 2023

Chris Evans

R tricks

Distributions

Distribution tests

Null hypothesis tests (NHSTs)

Gaussian distribution

Introduction to four tests of fit to Gaussian distribution available in R

Nov. 11, 2023

Chris Evans

R tricks

Distributions

Distribution tests

Null hypothesis tests (NHSTs)

Gaussian distribution

First post about using R to test fit to univariate Gaussian (a.k.a. 'Normal') distribution: Kolmogorov-Test

Nov. 8, 2023

Chris Evans

R tricks

R programming

Simulation

I had previously found the structure of tryCatch() difficult: cracked it!

Nov. 1, 2023

Chris Evans

RCSC paradigm

Jacobson plot

CECPfuns package

Plots and graphs

1.xi.23 This is very early work in progress and will evolve a lot over the next week and then get into CECPfuns R package on github.

Aug. 9, 2023

Chris Evans

Confidence intervals

ECDFs

Quantiles (quartiles, [per]centiles, deciles)

A general coverage of quantiles, the ECDF (Empirical Cumulative Distribution Function) and confidence intervals (CIs) around quantiles

Aug. 9, 2023

Chris Evans

Confidence intervals

ECDFs

Quantiles (quartiles, [per]centiles, deciles)

Mapping to referential data

Exploring the use of quantiles and their confidence intervals, and ECDFs to map individuals' scores to referential data.

Aug. 9, 2023

Chris Evans

Geeky stuff

Shiny

R packages

R tricks

R programming

This is very much work in progress and will probably always be that way.

Aug. 7, 2023

Chris Evans

Distributions

ECDFs

A general introduction to the ECDF and quantiles and why they're useful.

Aug. 6, 2023

Chris Evans

R style

Wise practices

I've learned a lot about data analysis from my errors, here's what I wish I'd known earlier!

June 15, 2023

Chris Evans

Distill package

R graphics

R tricks

This is a developing miscellany of the things that I seem to keep forgetting about R. What I used to call in my student days "teflon coated facts"!

June 10, 2023

Chris Evans

RCSC paradigm

R graphics

Jacobson plot

Granularity of scores

The Jacobson plot and RCSC (Reliable and Clinical Change) methods for those who have never met them before or don't feel confident they understand them.

Sept. 11, 2022

Chris Evans

R graphics

R tricks

As title says: very simple stuff about circles in ggplot, does open up somne ideas about drawing therapy groups.

July 23, 2022

Chris Evans

Rigorous idiography

Method of derangements

Follows on from 'Scores from matching things'

July 15, 2022

Chris Evans

Rigorous idiography

Method of derangements

Mostly about the method of derangements but some huxtable!

June 19, 2022

Chris Evans

R tricks

R programming

Data import in R

Database handling

Work in progress about reading data from M$ mdb file into R

April 18, 2022

Chris Evans

Confidence intervals

Proportions

Exact confidence intervals

This describes the ExactCIdiff package, unpacks the arguments to the functions, looks at timings and notes an oddity, a typo I think, in the original paper about the package.

Feb. 12, 2022

Chris Evans

Change scores

Pre/post change

Teaching myself about pre/post therapy change analyses using R. Probably the first of a series of posts.

Jan. 24, 2022

Chris Evans

Agreement

Cohen's kappa

Simple plotting of raw agreement and Cohen's kappa for various prevalences of the rated quality and only chance agreement

Jan. 15, 2022

Chris Evans

R graphics

Distributions

Correlation

Regression

This just clarifies the distinction between a data ellipse and a confidence ellipse, i.e. an ellipse describing the joint confidence intervals on two parameters of a model

Nov. 12, 2021

Chris Evans

R geeky

R packages

Reminder (for CE!)

For anyone else who hits this and doesn't want to wait for someone to put the compiled package into CRAN

Nov. 9, 2021

Chris Evans

OMbook & glossary

Code used for entries in the glossary for the OMbook

Oct. 31, 2021

Chris Evans

Correlation

Psychometrics

Regression

Reliability

A look at subscale/total correlations in the null model

April 9, 2021

Chris Evans

Correlation

Psychometrics

Regression

Reliability

How does internal reliability relate to number of items?

March 26, 2021

Chris Evans

Raspberry pi

Geeky stuff

I thought I should document this process as it turned out to be fairly easy

Feb. 28, 2021

Chris Evans

R tricks

Rmarkdown

R programming

This may be of use to others but it's partly for me as I keep forgetting these and searching around for the .Rmd files in which I used the one I want!

Feb. 10, 2021

Chris Evans

R packages

R tricks

R programming

This is very much work in progress so look for later posts about CECPfuns as well as this.

Feb. 10, 2021

Chris Evans

R packages

Tidyverse

Piping

R tricks

R programming

This extends https://www.psyctc.org/Rblog/posts/2021-02-07-why-pipe-why-the-tidyverse/ and introduces rowwise()

Feb. 7, 2021

Chris Evans

R packages

R programming

Piping

Tidyverse

A short description of the post.

Feb. 6, 2021

Chris Evans

Distill package

R graphics

R tricks

Just documenting how I have created these pages with the Distill package.

Jan. 27, 2021

Chris Evans

Confidence intervals

Bootstrapping

Correlation

A quick exploration of bootstrapping a Spearman and why you might, or might not, want it.

Jan. 27, 2021

Chris Evans

Graphics

Overprinting

Jittering

R tricks

R graphics

This is the first of my blog posts here, about the issue of overprinting and some ways to handle it using R and ggplot(). There's a small spin off topic on the impact on bivariate correlations and on linear regression of discretising continuous variables.

Jan. 27, 2021

Chris Evans

Graphics

Nudging

Jittering

R tricks

R graphics

How to nudge categories on an axis of a ggplot plot.

- Articles (44)
- Agreement (1)
- Bootstrapping (1)
- CECPfuns package (3)
- Change scores (1)
- Cohen's kappa (1)
- Confidence intervals (5)
- Correlation (9)
- Data import in R (1)
- Database handling (1)
- Distill package (2)
- Distribution tests (2)
- Distributions (6)
- ECDFs (3)
- Effect sizes (1)
- Exact confidence intervals (1)
- Gaussian distribution (4)
- Geeky stuff (3)
- Granularity of scores (1)
- graphics (1)
- Graphics (2)
- Jacobson plot (2)
- Jittering (2)
- Mapping to referential data (1)
- Method of derangements (2)
- Multiple tests problem (1)
- n=1 (1)
- Non-parametric statistics (1)
- Nudging (1)
- Null hypothesis tests (NHSTs) (6)
- OMbook & glossary (1)
- Overprinting (1)
- Piping (2)
- Plots and graphs (2)
- Pre/post change (1)
- Proportions (1)
- Psychometrics (4)
- Quantiles (quartiles, [per]centiles, deciles) (2)
- R geeky (1)
- R graphics (9)
- R markdown (1)
- R packages (5)
- R programming (7)
- R style (1)
- R tricks (16)
- Rank methods (1)
- Raspberry pi (1)
- RCSC paradigm (3)
- Regression (3)
- Reliability (2)
- Reminder (for CE!) (1)
- Rigorous idiography (2)
- Rmarkdown (1)
- Shiny (1)
- Simulation (2)
- Standardising (1)
- Tidyverse (2)
- Transformations (1)
- Wise practices (1)

At the top you should find a search box and a menu. Probably the best way to find if I have something you want here is to use that search. However, you may also find things using the “CATEGORIES” menu on the right of this main page.

Going back to the top right of the menu bar “Welcome” gives you a bit more than this introduction, “About” gives you some geeky background and you can guess what “Copyright/permissions” gives you. I hope it’s all useful, do please contact me if you have suggestions, comments, corrections or requests. What follows below is the full list of posts in reverse chronological order of creation. Code used in the posts is in them and revealed by hitting the “Show code”, buttons. Inside code blocks there is a “copy to clipboard” button if you hover your cursor inside the block.