ATI                     Abiotic Tolerance Index (ATI)
DRI                     Drought resistant index (DRI)
Golden_mean             Golden Mean (GM)
HAM                     Harmonic Mean
R_drought_index         Relative Drought Index (RDI)
YR_ratio                Yield reduction ratio (YR)
YSI                     Yield reduction index or Yield Stability Index
                        (YSI)
Y_index                 Yield index (YI)
all_indices             All indices combined
calculate_PEG_6000      Calculate Polyethylene glycol (PEG) 6000
                        requirement
caro_total              Total carotenoids content
chl_a                   Chlorophyll'a' Concentration by Arnon method
chl_b                   Chlorophyll b concentration
chl_total               Total chlorophyll (a+b) concentration
gmp                     Geometric mean productivity (GMP) by Fernandez
                        (1992)
mp_index                Mean productivity Index (MPI)- by Hossain et
                        al., (1990)
peg_6000                Water potential of Polyethylene glycol (PEG)
                        6000
ss_index                Stress susceptibility index (SSI) by Fischer
                        and Maurer (1978)
st_index                Calculate Stress tolerance index (STI)
                        suggested by Fernandez (1992)
tol_index               Tolerance index -TOL by Hossain et al., (1990)
yield_data              Example data
yield_reduction         Yield Reduction
