Having joined the assessment analytics working group for Moodle Moot AU this year, I thought I’d have a play around with the feedback event data and it’s relation to future assignments. The simplified assumption to explore is that learners who view their feedback are enabled to perform better in subsequent assignments, which may be a reduction of potentially more complex distance travelled style analytics. To get started exploring the data I have produced a simple timeline that shows the frequency of assignment views within a course based on the following identified status of the submission:
- Pre-submission includes activities when the learner is preparing a submission
- Submitted includes views after submission but before receiving feedback (possibly anxious about results)
- Graded includes feedback views once the assignment is graded
- Resubmission includes activities that involve the learner resubmitting work if allowed
The process I undertook was to sort the log data into user sequences and use a function to set the status based on preceding events. For example, once the grade is released then count subsequent views as ‘graded’. This gives an idea of the spread and frequency of assignment engagement.
The timeline uses days on the x-axis and users on the y-axis. Each point plotted represents when events were logged for each learner – coloured by the status and sized according to the frequency on that day. There are a few noticeable vertical blue lines which correspond to feedback release dates (i.e. many learners view feedback immediately on its release) and you start to get an idea that some learners view feedback much more than others. The pattern of yellow points reveal learners who begin preparing for their assignment early, contrasted with those who cram a lot of activity closer to deadlines. I have zoomed into a subset of the learners below to help show this.
Having put this together quickly I am hoping I will have some time to refine the visualisation to better identify some of the relationships between assignments. I could also bring in some data from the assignment tables to enrich this having limited myself just to event data in the logs thus far. Some vertical bars showing deadlines, for example, might be helpful, or timelines for individual users with assignments on the y-axis to see how often users return to previous feedback across assignments as shown below. Here you can see the very distinct line of a feedback release, which for formative assessment it may have been better learning design to release feedback more regularly and closer to the submission.
Enhanced communication has long been championed as a benefit of online learning environments, and many educational technology strategies will include statements around increased communication and collaboration between peers. So in thinking towards an engagement metric for my current project and the need to get inside activities for my, in progress, PhD proposal exploring forum use is one of the more interesting analytics spaces within the LMS. I’ve used three techniques for my initial analysis: (1) a look at post and reply counts inspired by @phillipdawson and his work on the Moodle engagement block, (2) social network analysis inspired by a paper by @shaned07 on teacher support networks; and (3) sentiment and political view analysis provided by @indicoData as an introduction to text mining.
I’ll start with sharing the visualisations and where these might be useful and then finish with details of how I coded these.
Following Phillip Dawson’s work on the engagement block for Moodle, I decided to look into two posting patterns: (1) posts over time; and (2) average post word count. The over time analysis (above) compares the weekly posting pattern of each student in a group. For most students replies to peers and teachers are “in phase” suggesting that when they are active they discuss with the entire group and so learning design might focus on keeping them active. One can also notice that those who only reply to peers appear to have much lower overall post activity, which in the original engagement block would place them at-risk – learning design may consider teacher-led interventions to understand whether discussions with the teacher impact their overall activity. The average word count analysis (below) reinforces the latter case where those demonstrating that those who only reply to peers infrequently post shorter replies. Conversely those who post infrequent lengthy posts tend to target the teacher and do not follow up with many further replies discussion. There is some suggestion of an optimal word count around 75-125 for forum posts that might warrant further investigation.
Social Network Analysis
The network diagram (above) confirms what was emerging in the post analysis: that a smaller core of students (yellow circles) are responsible for a majority of the posts, and further reveals the absolute centrality of the teacher (blue circle) that highlight how important teacher-led interventions may be to this group. This is probably not surprising although the the teacher may use this to consider how they might respond more equally to the group – here the number of replies is represented by increasing thickness of the grey edges and they appear to favour conversations in the lower left of the network. A similar theme is explored by Shane Dawson (2010) in “‘Seeing’ the learning community”. One can understand this further by plotting eigenvalue centrality against betweenness centrality (below) where a student with high betweenness and low eigenvalue centrality may be an important gatekeeper to a central actor, while a student with low betweenness and high eigenvalue centrality may have unique access to central actors.
Text analysis of forums provides a necessary complement to the above analysis, exploring the content within the context. I have used the Indico API to aid my learning of this part of the field rather than try to build this from scratch. The sentiment analysis API determines whether a piece of text was positive or negative in tone and rates this on a scale from 0 (negative) to 1 (positive). Plotting this over time (above) provides insights into how different topics might have been received with this group showing generally positive participation, although with two noticeable troughs that might be worth some further exploration. The political opinion API scores political leaning within a text on a scale of 0 (neutral) to 1 (strong). Plotting this for each user (below) shows that more politicised posts tend to be conservative (unsurprising) although there is a reasonable mix of views across the discussion. What might be interesting here is how different student respond to different points of view and whether a largely conservative discussion, for example, might discourage contribution from others. Plotting sentiment against libertarian leaning (below2) shows that participants are, at least, very positive when leaning towards libertarian ideology, though this is not the only source of positivity. Exploring text analysis is fascinating and if projects such as Cognitive Presence Coding and the Quantitative Discourse Analysis Package make this more accessible then there are some potentially powerful insights to be had here. I had also hoped to analyse the number of external links embedded in posts following a talk by Gardner Campbell I heard some years ago about making external connections of knowledge, however the dataset I had yielded zero links, which while informative to learning design is not well represented in a visual (code is included below).
How long do users spend on Moodle (or more generally e-Learning) is another common question worth some initial exploration as part of my broader goal towards the notion of an engagement metric. This article discusses an approach into defining and obtaining insights from the idea of a session length for learning. This is mostly a data wrangling exercise to approximate the duration from event logs that will tell us that while all events are born equal, some are more equal than others. The algorithm should prove useful when I progress to course breakdowns in identifying particularly dedicated or struggling students who are investing larger amounts of time online, or those at-risk who aren’t spending enough. These questions are something I will return later in a future post as part of the project.
This works on the same data as last week’s look at some basic distribution analysis which contains extraction SQL.
At some point I always come back to the question of how do we understand use of the VLE/LMS, which I’ve theorised a lot. As part of an interest to learn about Data Science I’ve signed up to Sliderule () and am being mentored through a capstone project with some Moodle data. The main goal is for me to learn R, which I’d never touched until 2 weeks ago, but hopefully the data can tell me something about Moodle at the same time. Feedback or advise on techniques is welcomed.
Exploratory Data Analysis on mdl_logstore_standard
For this part I am going to focus on producing some simple two-dimensional analysis. This assumes you have MySQL access to your Moodle database and RStudio.
Day of week