# Power Quality Impact and Its Assessment: A Review and a Survey of Lithuanian Industrial Companies
## 5 Discussion
### Further Analysis of the Survey Results: PQ Impact Similarity Assessment
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multicolumn{1}{c}{**No. **} & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** & **9** \\ \hline
**1** & - & z & z & z & t & t & t & t & t \\
**2** & z & - & z & z & t & t & t & t \\
**3** & z & z & - & z & t & t & t & t \\
**4** & z & z & z & - & t & t & t & t & t \\
**5** & t & t \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**No.** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** & **9** \\ \hline
**1** & - & 0.821 & 5.263 & 6.220 & 2.192 & 1.273 & 0.168 & 0.149 & 2.321 \\
**2** & 0.821 & - & 4.435 & 5.370 & 1.570 & 0.796 & 0.227 & 0.640 & 2.057 \\
**3** & 5.263 & 4.435 & - & 0.877 & 2.209 & 2.427 & 3.099 & 4.025 & 0.066 \\
**4** & 6.220 & 5.370 & 0.877 & - & 3.012 & 3.144 & 3.760 & 4.790 & 0.396 \\
**5** & 2.192 & 1.570 & 2.209 & 3.012 & - & 0.458 & 1.259 & 1.791 & 1.250 \\
**6** & 1.273 & 0.796 & 2.427 & 3.144 & 0.458 & - & 0.767 & 1.144 & 1.476 \\
**7** & 0.168 & 0.227 & 3.099 & 3.760 & 1.259 & 0.767 & - & 0.237 & 1.953 \\
**8** & 0.149 & 0.640 & 4.025 & 4.790 & 1.791 & 1.144 & 0.237 & - & 2.234 \\
**9** & 2.321 & 2.057 & 0.066 & 0.396 & 1.250 & 1.476 & 1.953 & 2.234 & - \\ \hline \hline \end{tabular}
\end{table} 
Table 38: Similarity results when the significance level is 0.05. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**No.** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** & **9** \\ \hline
**1** & - & 0.821 & 5.263 & 6.220 & 2.192 & 1.273 & 0.168 & 0.149 & 2.321 \\
**2** & 0.821 & - & 4.435 & 5.370 & 1.570 & 0.796 & 0.227 & 0.640 & 2.057 \\
**3** & 5.263 & 4.435 & - & 0.877 & 2.209 & 2.427 & 3.099 & 4.025 & 0.066 \\
**4** & 6.220 & 5.370 & 0.877 & - & 3.012 & 3.144 & 3.760 & 4.790 & 0.396 \\
**5** & 2.192 & 1.570 & 2.209 & 3.012 & - & 0.458 & 1.259 & 1.791 & 1.250 \\
**6** & 1.273 & 0.796 & 2.427 & 3.144 & 0.458 & - & 0.767 & 1.144 & 1.476 \\
**7** & 0.168 & 0.227 & 3.099 & 3.760 & 1.259 & 0.767 & - & 0.237 & 1.953 \\
**8** & 0.149 & 0.640 & 4.025 & 4.790 & 1.791 & 1.144 & 0.237 & - & 2.234 \\
**9** & 2.321 & 2.057 & 0.066 & 0.396 & 1.250 & 1.476 & 1.953 & 2.234 & - \\ \hline \hline \end{tabular}
\end{table} 
Table 37: Scores determined using method No. 2b. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**No.** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** & **9** \\ \hline
**1** & - & 3/3 & 0/3 & 0/3 & 0/3 & 3/3 & 3/3 & 3/3 & 0/3 \\
**2** & 3/3 & - & 0/3 & 0/3 & 3/3 & 3/3 & 3/3 & 3/3 & 0/3 \\
**3** & 0/3 & 0/3 & - & 3/3 & 0/3 & 0/3 & 0/3 & 3/3 \\
**4** & 0/3 & 0/3 & 3/3 & - & 0/3 & 0/3 & 0/3 & 3/3 \\
**5** & 0/3 & 3/3 & 0/3 & 0/3 & - & 3/3 & 3/3 & 1/3 & 3/3 \\
**6** & 3/3 & 3/3 & 0/3 & 0/3 & 3/3 & - & 3/3 & 3/3 & 3/3 \\
**7** & 3/3 & 3/3 & 0/3 & 0/3 & 3/3 & 3/3 & - & 3/3 & 0/3 \\
**8** & 3/3 & 3/3 & 0/3 & 0/3 & 1/3 & 3/3 & 3/3 & - & 0/3 \\
**9** & 0/3 & 0/3 & 3/3 & 3/3 & 3/3 & 0/3 & 0/3 & - \\ \hline \hline \end{tabular}
\end{table} 
Table 35: Scores determined using method No. 1. It must be understood that the applied statistical method does not imply causation, thus the researcher has to figure it out by himself. The similarity of some samples can be accidental. Let us take a deeper look to all the most similar cases in order of priority:  
1. The similarity of \"Controllers\" (No. 1) with both \"Servers\" (No. 6) and \"Variable-frequency drives\" (No. 8) seems to be logical because all of them are based on printed circuit boards, but the similarity with both \"LV three-phase electric motors\" (No. 2) and \"MV three-phase electric motors\" (No. 7) cannot be explained and confirmed;
2. The similarity of \"LV three-phase electric motors\" (No. 2) with \"MV three-phase electric motors\" (No. 7) and \"Variable-frequency drives\" (No. 8) seems very logical, but with \"Servers\" (No. 6) cannot be explained and confirmed;
3. The similarity of \"Lighting\" (No. 3) with \"Heating elements\" (No.