Day3_​S4_​Drift_​vs_​Degradation

1 · Read and Lock Constants

Read S3's state file and declare the 5 locked constants.

Step 1 · Read and prepare

1. Read day03_state.csv with CSV Reader
2. Parse the timestamp with String to Date&Time
3. Declare K_SIG / H_SIG / LAMBDA with Variable Creator

2 · Build the CUSUM

Per pump: standardize the residual, then accumulate a running CUSUM statistic.

Step 2 · CUSUM per pump

1. Loop per pump with Group Loop Start
2. Standardize z = (residual-mean)/sd, then u = z - K_SIG with Math Formula
3. Running sum and floor with Moving Aggregator x2, S = C - Cmin
4. Flag S > H_SIG with Rule Engine

3 · Compare Detectors

An EWMA and a Shewhart 3-SD alert, for comparison.

Step 3 · Two more drift detectors

1. Smooth with Moving Average, EWMA lambda=0.2
2. Flag |z|>3 on the raw residual with Rule Engine
3. Collect every pump back with Loop End

4 · Outputs

Plot both alarm styles and write the labeled alarm table.

Step 4 · Plot and write

1. Plot CUSUM and its alert with Line Plot
2. Plot 3-SD chart with a second Line Plot
3. Write day03_s4_alarms with CSV Writer

Explore before deciding

1. Profile the S3 output with Statistics
2. Keep the reference period with Row Filter, plot with Histogram