Improved Seed Genetic Gain Height Percent
Compare matched improved/control height observations using pooled and paired relative gains; signed reductions remain and contrasts alone do not attribute causal genetic gain.
Description
Matched improved-seed and control heights permit signed observed contrasts.
Matched improved-seed and control heights permit signed observed contrasts. Pooled relative gain and mean paired relative gain weight unequal controls differently.1
Compare matched improved/control height observations using pooled and paired relative gains; signed reductions remain and contrasts alone do not attribute causal genetic gain.
When to use Improved Seed Genetic Gain Height Percent
Use this tool to compare matched improved/control height observations using pooled and paired relative gains; signed reductions remain and contrasts alone do not attribute causal genetic gain.
Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
How to use Improved Seed Genetic Gain Height Percent and understand its results
- Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
- Enter improvedSeedHeightsM, matchedControlHeightsM using the field table and calculation rules, then run the tool.
- Read pairedHeightContrastsM, pooledHeightGainPercent, meanPairedRelativeGainPercent. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| improvedSeedHeightsM | Improved seed heights m | list of number | Required |
| matchedControlHeightsM | Matched control heights m | list of number | Required |
Pair nonnegative improved heights with positive matched control heights in meters. Return per-pair differences and both relative gains, retaining negative reductions.
Paired lists must be nonempty and have equal lengths.
pooled %=100(Σimproved/Σcontrol−1); mean paired %=100mean(improved/control−1) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| pairedHeightContrastsM | Paired height contrasts m | list of number |
| pooledHeightGainPercent | Pooled height gain percent | number |
| meanPairedRelativeGainPercent | Mean paired relative gain percent | number |
{
"input": {
"improvedSeedHeightsM": [
3,
6
],
"matchedControlHeightsM": [
2,
4
]
},
"output": {
"pairedHeightContrastsM": [
1,
2
],
"pooledHeightGainPercent": 50,
"meanPairedRelativeGainPercent": 50
}
}Limitations and assumptions
Observational contrasts alone do not attribute causal genetic improvement or forecast future growth.
Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Nitrogen Fertilizer Response m³/yr Gain: Calculate paired before/after/control annual volume-growth contrasts, retaining signed response; observational contrasts alone do not establish causal fertilizer efficacy or an application rate. For a complementary task, use Chapman-Richards Site Index Height Age: Normalize supplied dominant height/age to a reference-age Chapman–Richards site index with explicit growth/shape calibration; no generic height/age ratio or universal regional site table.
References
Similar or alternative tools
- Nitrogen Fertilizer Response m³/yr Gain
Calculate paired before/after/control annual volume-growth contrasts, retaining signed response; observational contrasts alone do not establish causal fertilizer efficacy or an application rate.
- Chapman-Richards Site Index Height Age
Normalize supplied dominant height/age to a reference-age Chapman–Richards site index with explicit growth/shape calibration; no generic height/age ratio or universal regional site table.