# Statistical Analysis of the Weight and Center-of-Gravity Position of an Empty Container Ship
## 5 Summary and Conclusions  
In the preliminary design of cargo ships, one of the most important steps is the prediction of the weight light ship and the coordinates of the center of gravity position. Formulas useful for calculating weights based on design assumptions and basic ship dimensions are scarce in the publications, and those available are very inaccurate.  
During the research, the results of which are presented in the article, appropriate regression formulas were developed for relatively new container ships, for which relevant weight data were collected. The publication uses accurate weight group calculations for container ships built in a shipyard, of which post-construction measurement data were also used.  
The authors' regression formulas are characterized by very high accuracy in predicting not only the weight light ship and the coordinates of the center of gravity position, but also the individual weight groups into which the ship's structure and equipment are divided.  
The functional relationships presented in the article are a complete novelty in terms of application and accuracy in predicting the weight of a ship at the preliminary design stage. They are directly applicable to the design of manned container ships in the 270 to 3100 _TEU_ range.  
By developing functional relationships applicable to the whole ship and to specific weight groups, it will be possible to use them, after appropriate modification and analysis of the structure and equipment, for the preliminary design of unmanned container ships. On this basis, a method for designing unmanned container ships will be prepared, as well as a method for evaluating the benefits of their operation, particularly for reducing fuel consumption and emissions of CO\({}_{2}\) and other exhaust gases.  
Conceptualisation, T.S.; methodology, T.S. and K.Z.; validation, T.S. and K.Z.; formal analysis, T.S. and K.Z.; investigation, T.S. and K.Z.; resources, T.S. and K.Z.; Writing--Original draft preparation, T.S. and K.Z.; Writing--Review and editing, T.S. and K.Z.; visualisation, K.Z.; project administration, T.S. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding author.  
The authors declare no conflict of interest.  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline \multirow{3}{*}{**Measurement**} & \multirow{3}{*}{**Regression (37)**} & \multicolumn{6}{c}{**Weight \(M_{4}\) Calculated from the Formulas in the Publication:**} \\ \cline{3-13}  & & & \multirow{3}{*}{**[PERSON] [25]**.} & \multirow{3}{*}{**[PERSON] [15]**.} & \multirow{3}{*}{**[PERSON] [22]**.} & \multicolumn{3}{c}{**[PERSON]**} & \multirow{3}{*}{**[PERSON] [29]**.} \\  & & & & & & & & & & & [14]. & \\ \cline{3-13}  & & **v** & **e** & **v** & **e** & **v** & **e** & **v** & **e** & **v** & **e** \\ \hline A & 738.7 & 695.9 & 5.8\% & 1187 & \(-\)60.7\% & 1299 & \(-\)75.8\% & 959 & \(-\)29.8\% & 1874 & 153.7\% & 1387 & \(-\)87.8\% \\ \hline B & 1073.0 & 1022.4 & 4.7\% & 1739 & \(-\)62.1\% & 1930 & \(-\)79.9\% & 1404 & \(-\)30.8\% & 2898 & \(-\)170.1\% & 1973 & \(-\)83.9\% \\ \hline \hline \end{tabular}
\end{table}
Table 9: Engineroom weight (weight group **4—\(M_{4}\)**)—Comparison of calculations with measurements for different methods.