Posts

Solution Feedback

Download a simple demo .rmd/.html. I’d noticed that students were tending to just look at the hidden solutions and not try very hard to understand the exercises, so I wanted a way for them to check if they’re right, but not give them the answer immediately.

2017-11-15 4 min read rstats

Face Research Lab PreReg Example

input[type=text] { width: 100%; } textarea { width: 100%; height: 6em; } .example { background-color: #DDEEFF; border: 1px solid #BBCCDD; border-radius: 0.5em; padding: 0.5em 0.5em 0.5em 0.5em;} .eval { font-size: smaller; color: #666666; } Here is my internal lab pre-registration form (including an example).

2017-10-23 15 min read prereg

Hidden Solutions

library(tidyverse) The R for Reproducible Scientific Analysis pages at software carpentry have a really nice interface for hiding and showing solutions to exercises. I’ve created my own lightweight solution that you can use in any html file, including those made by RMarkdown (e.

2017-10-21 2 min read rstats

This is a tutorial in progress on how to calculate Cronbach’s alphas using the psych package in R. library(tidyverse) library(psych) disgust <- read_csv("https://psyteachr.github.io/msc-data-skills/data/disgust.csv") SPSS Under the Analyze menu, choose Scale and Reliability Analysis.

2017-09-12 6 min read rstats

nest() and irr::icc()

I’m going to use intra-class correlations to demonstrate how to run an analysis on subgroups of data (because I’m constantly forgetting exactly how to do it). library(tidyverse) library(irr) Load the rating data for the open-source Face Research Lab London Set.

2017-08-21 6 min read rstats

Cumulative p

EJ Wagenmakers started an interesting debate last night with a twitter poll on p-values. Some responses suggested you can multiply p-values from several tests to create a sort of cumulative p-value that is the joint probability of the null hypothesis.

2017-07-27 2 min read stats

sample()

First, let’s make a data frame with two variables, a and b that are both sampled from a normal distribution with a mean of 0 and SD of 1. The variablle n will be how many samples we’ll take (100).

2017-07-26 3 min read rstats

recode()

I often find myself needing to recode variables. I wrote previously about recoding a characters into a numbers using various coding schemes. But sometimes I want to recode numeric values into characters; this is particularly useful for graphing and for double-checking the meaning of your variable levels.

2017-07-14 3 min read rstats

PCA

Download the Rmd notebook for this example Putting together this page made me realise I still don’t know anything about PCA and factor analysis. I use the psych package for SPSS-style PCA.

2017-06-26 8 min read rstats

library(tidyverse) library(lmerTest) How you choose to code categorical variables changes how you can interpret the intercept and effects of those variables. My favourite tutorial on coding schemes explains things in detail.

2017-06-23 3 min read rstats