I stay with this Explore page and its model logic.
coach_text Explore goals Goal, controls, KPIs and takeaway
ML3 / Explore
Read equilibrium instead of a one-off wave
SIS is not mainly about one outbreak peak. It is about whether the system settles into a recurring infectious balance.
This Explore step helps you stop reading only for a dramatic peak and start reading for where the model stabilises.
If the line starts to feel like a long-run balance instead of a single event, then the Explore step is doing the right work.
Read the three active controls before dragging them
In the academic variant you compare R₀, duration and mitigation together.
The main task here is to feel the difference between baseline transmission, how long infection remains effective and how strongly contacts are damped.
R₀
What it changes
The baseline transmission pressure pushing the system upward.
Watch for
Whether the eventual equilibrium sits higher or lower.
Duration D
What it changes
How long infectious influence remains active.
Watch for
Whether the system approaches equilibrium more slowly and sustains more infectious load.
Mitigation
What it changes
How strongly transmission opportunities are reduced.
Watch for
Whether the equilibrium level drops and the system settles lower.
Use the playhead too. SIS becomes readable when you inspect the path toward equilibrium, not only the final end state.
Use the KPI cards to read the balance point
The KPI cards help you read both the destination and the path toward it.
I*
The endemic equilibrium of the infectious line.
t95
How long it takes until the line reaches 95% of that equilibrium.
Rₑff start
The initial transmission pressure at the beginning of the run.
I at the end
The infectious share at the selected horizon.
Good reading means: combine destination and timing. Say not only where the line settles, but also how quickly the system gets close to that balance.
What you should be able to say after this
If this Explore worked, you now read SIS as an equilibrium model and not just as another outbreak curve.
You should be able to explain how R₀, duration and mitigation shape both the equilibrium level and the time needed to approach it.
When that reading feels stable, the next sensible step later is Continue in Learning Journey.
SIS Model · Equilibrium pattern
S I
Day 0
t · Current day t · Day t
0
I · Infectious now I · I now I
0.0 %
S · Susceptible now S · S now S
0.0 %
Rₑff · Rₑff now Rₑff · Now Rₑff
0.00
I* · Endemic equilibrium I* · Equilib. I*
--
t95 · 95% approach t95 · 95% t95
0
R₀ · Basic reproduction R₀ · Basic repro R₀
1.25
N · Population N · Pop. N
1,000,000