Graphical analysis and first data interpretation

HAL Id: hal-02803115

https://hal.inrae.fr/hal-02803115

Submitted on 5 Jun 2020

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Graphical analysis and first data interpretation

Matieu Henry, Laurent Saint-André, Nicolas Picard

To cite this version:

Matieu Henry, Laurent Saint-André, Nicolas Picard. Graphical analysis and first data interpretation. Expert meeting on tree volume, biomass allometric equations and biomass expansion factors, UN-Reducing Emissions from Deforestation and forest Degradation (UN-REDD). Genève, CHE.; Food and Agriculture Organization (FAO). ITA., Jun 2012, Hanoi, Vietnam. 5 p. �hal-02803115�

Graphical analysis and first data

interpretation

Dr. Matieu Henry & Dr. Laurent Saint- André,

& Dr. Nicolas Picard

(a) Linear relation and constant variance of the residue,

(b) Non linear relation and constant variance

(c) Linear relation and non constant variance of the residue

(d) Non linear relations and non-constant variance of the residue

Different relations between two variables X and Y

Coefficients of determination (R2) for four linear regressions developed on cloud of

points which do not have linear relations

The coefficient of determination R

_{is used in the context of statistical models whose}

main purpose is the prediction of future outcomes on the basis of other related

information. It is the proportion of variability in a data set that is accounted for by the

statistical model

When you have more than one

input variables (X1, X2..)