A Mathematical Programming Approach to Brand Efficiency of Smartphones in the US Market
Table 6
Smartphone brand decomposition results stratified by brands: summary.
Brand
Year
DEA-MF
DEA-K
DEA-MTR
2013
2014
2015
Mean
2013
2014
2015
Mean
2013
2014
2015
Mean
Apple
0.881
0.963
0.967
0.937
0.893
0.963
0.967
0.941
0.985
1.000
1.000
0.995
BlackBerry
0.768
0.852
0.834
0.818
0.894
0.982
0.954
0.943
0.862
0.868
0.876
0.869
HTC
0.797
0.881
0.831
0.836
0.843
0.956
0.896
0.898
0.945
0.922
0.928
0.932
LG
0.780
0.853
0.865
0.833
0.823
0.902
0.939
0.888
0.948
0.946
0.923
0.939
Motorola
0.837
0.921
0.882
0.880
0.883
0.963
0.966
0.937
0.946
0.956
0.913
0.938
Nokia
0.769
0.896
0.811
0.825
0.833
0.966
0.892
0.897
0.923
0.928
0.911
0.921
Samsung
0.834
0.927
0.898
0.886
0.840
0.937
0.898
0.892
0.993
0.990
1.000
0.994
Sony
0.788
0.930
0.952
0.890
0.833
1.000
1.000
0.944
0.947
0.930
0.952
0.943
Mean
0.807
0.903
0.880
0.855
0.959
0.939
0.944
0.943
0.938
Note. DEA-MF denotes technical efficiency relative to the metafrontier. DEA-K denotes technical efficiency relative to the group frontiers. DEA-MTR refers to the technology gap ratio (DEA-K/DEA-MF).
