Hence, it can be a very thin shell and the system has a high efficiency of 50% in the payload mass to the total balloon package mass.
We therefore employed a proportional-odds logistic regression, which is an extension of standard logistic regression (Moutinho and Hutcheson 2011; Antione and Harrell 2000), implemented in R with the package MASS (Venables and Ripley 2002).
For MDS the R function "sammon" from the R package MASS was used with default parameters.
LDA was performed using the lda function from the R package "MASS".
It has been performed using the function stepAIC included in the R package MASS [ 15].
Correspondence analysis (CA) was conducted using the R package MASS (Venables and Ripley 2002).
LDA and QDA were performed with the R package MASS [ 42], FDA with the mda-package [ 43], and RDA with the klaR-package [ 44].
We used the package "MASS" to perform stepwise regression [ 32]; packages "glmnet" [ 33] and "gcdnet" [ 34] for penalized regression methods, and package "BMS" for Bayesian Model Averaging [ 35].
Detailed information about the algorithm is described in the R package "MASS" (http://cran.r-project.org/web/packages/MASS/index.html).html
We conducted the pDFA using a function written in R [ 58] by R. Mundry, and based on the function Ida of the R package MASS [ 59].
