Module 18 ยท How do you read the result?
Your first solution formula
- Print and read a CNA solution formula.
- Translate a formula into a plain-language sentence.
- Connect the formula back to the raw data rows.
Type the model's name to print it. CNA reports its solution as a formula. For our supervision data, the pattern that perfectly separates the low-coverage facilities from the healthy ones is this:
model
consistency: 1.000 coverage: 1.000
NoCold + NoSuper <-> LowCov
"Coverage is low wherever the cold chain was broken OR supervision was missing, and nowhere else." The + means OR, so this is two roads to the same sad place. The <-> means the combination tracks the outcome exactly.
Look back at Module 9. Every low-coverage facility had a broken cold chain or no supervision, and the two healthy facilities had neither. Notice what's missing from the formula: NoTrain and NoComm never made the cut, because they showed up on both the good and the bad side. CNA quietly ignored the red herrings and kept only what actually makes the difference, and it confirmed the pattern holds for every single case, with consistency and coverage both at 1.000. We unpack those two numbers in Part 8.
Read your result out loud.
- Can you say the formula as one sentence a colleague would understand?
- Do the facilities in the data actually match what the formula claims?