[jaspLearnStats] Change the default value of delta from 0 to 0.5 in Learn Stats -> E...

[sisyphus-jasp]

Summary

PR Summary: Change Default Delta Value in Learn Stats Effect Sizes

Root Cause

The default value for delta (Cohen's δ) in the Learn Stats → Effect sizes analysis was set to 0. When delta is 0, the two distributions (control and experimental) overlap exactly, making the visualization uninformative and unclear for learning purposes.

What Was Changed

• File: inst/qml/LSeffectSizes.qml
• Line: 65
• Change: Changed defaultValue: 0 to defaultValue: 0.5 for the effectSizeValueDelta option

Why This Fix Makes Sense

Setting delta to 0.5 by default provides a more informative visualization:

• The two distributions are clearly separated but still show overlap
• This value (0.5) represents a medium effect size, which is commonly used in teaching
• Students can better understand the concept of effect size when they can see the distributions actually differ

Caveats / Things to Check

• This is purely a QML default value change - no R code changes were required
• The change only affects the default value; users can still set delta to any value they want
• No tests exist for this module (tests/testthat directory is empty), so no regression testing was possible

Implementation Plan

No plan provided by agent.

Test Results

Baseline (before fix): Could not parse test summary
After fix: No tests exist in this module (tests/testthat/ directory is empty).
The change has been verified manually - defaultValue changed from 0 to 0.5 in inst/qml/LSeffectSizes.qml:65

Agent Stats

Turns: 25 | Cost: $1.54 | Duration: 8.2min

Log files

• JSONL: /home/openclaw/logs/module-developer-jaspLearnStats_1771797321.claude.jsonl
• Verbose: /home/openclaw/logs/module-developer-jaspLearnStats_1771797321.verbose.log
• Orchestrator: /home/openclaw/logs/module-developer-jaspLearnStats_1771797321.log