Methods & QC · RAPID-iNose Sensor Atlas

Published calculations

Normalization methods

Raw and clean signals are stored as source evidence. A dataset may use either a stored, versioned normalized output or an on-demand calculation; neither changes the source measurements. Unless a method says otherwise, R₀ is the mean or median signal within the approved baseline window.

Stored max-absolute-scaled response

x = (clean signal - mean R0) / abs(mean R0); y = x / max(|x|), per sample and sensor trace

Calculates a signed response from the approved baseline window, then preserves its sign and shape while scaling each trace to the interval [-1, 1].

Interpret with care: Because each trace is scaled independently, response magnitude cannot be compared between samples or sensor channels.

Imported baseline-normalized

Use the normalized value supplied with the published dataset

Reproduces the source dataset's stored response without recalculating a baseline.

Interpret with care: The source pipeline and baseline definition may differ between datasets; inspect dataset provenance before comparing values.

Source signal (no normalization)

y = raw or clean signal

Shows the selected source measurement as stored, with no baseline transformation.

Interpret with care: Absolute sensor levels can differ across channels and arrays, so magnitude alone is not a cross-sensor comparison.

Absolute baseline-relative change

|ΔR/R₀| = |R(t) − R₀| / |R₀|

Reports the size of change from the baseline while ignoring direction.

Interpret with care: A missing or near-zero baseline cannot produce a stable value.

Signed baseline-relative change

ΔR/R₀ = (R(t) − R₀) / |R₀|

Preserves whether the signal rises or falls relative to the baseline.

Interpret with care: A missing or near-zero baseline cannot produce a stable value.

Baseline ratio

R(t) / R₀

Expresses each measurement as a multiple of its baseline level.

Interpret with care: Ratios become unstable when the baseline is close to zero.

Baseline z-score

z = (R(t) − center(R₀)) / sd(R₀)

Expresses change in units of baseline variability for that sensor.

Interpret with care: Requires at least two variable baseline observations.

Channel and medium context

Sensor quality summaries

Understand sensor technology

These summaries indicate whether a sensor channel is suitable for interpretation in a given medium. A recommendation is supporting context, not a guarantee that every individual trace is valid.

FB · LW60

primary

Valid baseline fraction: 0.969
Saturated rows: 0.000
Abnormal rows: 0.005
Missing clean bins: 0.004

LW60 recommendation=primary; valid_r0=0.9689922480620154; saturation=3.568760498103799e-05; missing_clean_bins=0.0043287949505453.

FB · LW61

secondary_caution

Valid baseline fraction: 0.612
Saturated rows: 0.452
Abnormal rows: 0.002
Missing clean bins: 0.441

LW61 recommendation=secondary_caution; valid_r0=0.6124031007751938; saturation=0.4519311752642072; missing_clean_bins=0.4411743367754105.

FB · LW62

exploratory_only

Valid baseline fraction: 0.605
Saturated rows: 0.218
Abnormal rows: 0.013
Missing clean bins: 0.227

LW62 recommendation=exploratory_only; valid_r0=0.6046511627906976; saturation=0.2176563236056852; missing_clean_bins=0.2272980097216512.

FB · LW63

exploratory_only

Valid baseline fraction: 0.093
Saturated rows: 0.257
Abnormal rows: 0.131
Missing clean bins: 0.278

LW63 recommendation=exploratory_only; valid_r0=0.0930232558139534; saturation=0.2565724672506745; missing_clean_bins=0.2777683731953278.

FB · LW64

exploratory_only

Valid baseline fraction: 0.403
Saturated rows: 0.347
Abnormal rows: 0.002
Missing clean bins: 0.345

LW64 recommendation=exploratory_only; valid_r0=0.4031007751937984; saturation=0.3470024790989593; missing_clean_bins=0.3454088171991004.

FB · LW65

primary

Valid baseline fraction: 0.946
Saturated rows: 0.000
Abnormal rows: 0.007
Missing clean bins: 0.007

LW65 recommendation=primary; valid_r0=0.9457364341085271; saturation=7.137520996207597e-06; missing_clean_bins=0.0065778336678677.

LB · LW60

primary

Valid baseline fraction: 0.987
Saturated rows: 0.000
Abnormal rows: 0.002
Missing clean bins: 0.001

LW60 recommendation=primary; valid_r0=0.9866666666666668; saturation=0.0; missing_clean_bins=0.0013629200562204.

LB · LW61

secondary_caution

Valid baseline fraction: 0.893
Saturated rows: 0.162
Abnormal rows: 0.002
Missing clean bins: 0.162

LW61 recommendation=secondary_caution; valid_r0=0.8933333333333333; saturation=0.1624036256461641; missing_clean_bins=0.16210230418672.

LB · LW62

exploratory_only

Valid baseline fraction: 0.627
Saturated rows: 0.049
Abnormal rows: 0.031
Missing clean bins: 0.072

LW62 recommendation=exploratory_only; valid_r0=0.6266666666666667; saturation=0.0485697396058241; missing_clean_bins=0.071808850462115.

LB · LW63

exploratory_only

Valid baseline fraction: 0.080
Saturated rows: 0.214
Abnormal rows: 0.129
Missing clean bins: 0.244

LW63 recommendation=exploratory_only; valid_r0=0.08; saturation=0.2137068542656263; missing_clean_bins=0.2440904638187316.

LB · LW64

exploratory_only

Valid baseline fraction: 0.627
Saturated rows: 0.293
Abnormal rows: 0.002
Missing clean bins: 0.293

LW64 recommendation=exploratory_only; valid_r0=0.6266666666666667; saturation=0.2926216758970833; missing_clean_bins=0.2925593083180715.

LB · LW65

primary

Valid baseline fraction: 1.000
Saturated rows: 0.000
Abnormal rows: 0.002
Missing clean bins: 0.001

LW65 recommendation=primary; valid_r0=1.0; saturation=0.0; missing_clean_bins=0.0013203288044635.

Compare all QC values in a table

Medium	Sensor	Recommendation	Valid R0	Saturation	Abnormal	Missing bins	Rationale
FB	LW60	primary	0.969	0.000	0.005	0.004	LW60 recommendation=primary; valid_r0=0.9689922480620154; saturation=3.568760498103799e-05; missing_clean_bins=0.0043287949505453.
FB	LW61	secondary_caution	0.612	0.452	0.002	0.441	LW61 recommendation=secondary_caution; valid_r0=0.6124031007751938; saturation=0.4519311752642072; missing_clean_bins=0.4411743367754105.
FB	LW62	exploratory_only	0.605	0.218	0.013	0.227	LW62 recommendation=exploratory_only; valid_r0=0.6046511627906976; saturation=0.2176563236056852; missing_clean_bins=0.2272980097216512.
FB	LW63	exploratory_only	0.093	0.257	0.131	0.278	LW63 recommendation=exploratory_only; valid_r0=0.0930232558139534; saturation=0.2565724672506745; missing_clean_bins=0.2777683731953278.
FB	LW64	exploratory_only	0.403	0.347	0.002	0.345	LW64 recommendation=exploratory_only; valid_r0=0.4031007751937984; saturation=0.3470024790989593; missing_clean_bins=0.3454088171991004.
FB	LW65	primary	0.946	0.000	0.007	0.007	LW65 recommendation=primary; valid_r0=0.9457364341085271; saturation=7.137520996207597e-06; missing_clean_bins=0.0065778336678677.
LB	LW60	primary	0.987	0.000	0.002	0.001	LW60 recommendation=primary; valid_r0=0.9866666666666668; saturation=0.0; missing_clean_bins=0.0013629200562204.
LB	LW61	secondary_caution	0.893	0.162	0.002	0.162	LW61 recommendation=secondary_caution; valid_r0=0.8933333333333333; saturation=0.1624036256461641; missing_clean_bins=0.16210230418672.
LB	LW62	exploratory_only	0.627	0.049	0.031	0.072	LW62 recommendation=exploratory_only; valid_r0=0.6266666666666667; saturation=0.0485697396058241; missing_clean_bins=0.071808850462115.
LB	LW63	exploratory_only	0.080	0.214	0.129	0.244	LW63 recommendation=exploratory_only; valid_r0=0.08; saturation=0.2137068542656263; missing_clean_bins=0.2440904638187316.
LB	LW64	exploratory_only	0.627	0.293	0.002	0.293	LW64 recommendation=exploratory_only; valid_r0=0.6266666666666667; saturation=0.2926216758970833; missing_clean_bins=0.2925593083180715.
LB	LW65	primary	1.000	0.000	0.002	0.001	LW65 recommendation=primary; valid_r0=1.0; saturation=0.0; missing_clean_bins=0.0013203288044635.

Evidence roadmap

Planned analysis layers

Planned layers are not yet part of the current evidence base. Their status is shown to distinguish future work from available results.

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