# Updating Financial Contingency in Execution of Typologically Diverse Construction Projects
## 3 Results
### Analysis of Cost Overruns by Investment Group  
Box plots were made for all the groups of facilities selected for analysis based on the values of CPI cost overrun indicators determined for each investment in each month of its implementation. The function of box plots ideally fits the main goal of the research works, which is updating financial contingency in execution of construction projects. The bottom whisker value of the box plot, which belongs to the typologically consistent group of already executed construction projects, indicates the maximum level of the assumed financial contingency for future projects in the same group. This is why box plots were chosen over alternatives like histograms or scatter plots. The charts were additionally plotted with a financial contingency level of 3% and corresponding to the value of CPI = 0.97, which was marked with a red line. Values less than \"1\" indicate cost overspending. Figure 6: Variability of the execution rate of the cost of investment in the group of logistics centres (L). In the group of residential buildings (M), box plots were made, showing the ranges of the course of cost overruns (Figure 7). Juxtaposition of the graphs of individual investments shows that in the case of eight projects, their course took place without any disturbances associated with cost deviation. In four cases, values were observed that exceeded the value of 0.97 accepted as the financial contingency. The median values determined for the cost deviations of these investments showed that, in each case, at least half of them were on the overshoot side. The occurrence of outlier observations in investment M.12 and the long \"whiskers\" marking the 1.5 quartile gap indicates significant outliers. The varying magnitude of the quartile range in each investment indicates the different course of each investment. For the group of office buildings (O), box plots showing the distribution of cost overruns are shown in Figure 8. Observation of individual plots indicates the presence of deviations both in the direction of cost savings incurred relative to planned costs and in the direction of cost overspending. Analogously to the group of residential buildings (M), the varying size of the quarterly spread in individual investments indicates their different course. The presence of \"whiskers\", especially in investments O.1, O.2 and O.4, indicates the presence of extreme values that significantly deviate from the average values represented by the boxes. In the case of investments O.2 and O.4, there was a cost deviation resulting in an overrun of the financial contingency. The value representing the highest overspending, represented in the charts by the lower \"whiskers\", was 0.84. Analyzing the medians, it was observed that, in three cases, the average values of cost deviations obtained CPI values greater than \"1\", which means that savings occurred. The group of hotel buildings (H) is represented by nine developments. Box plots developed based on CPI values for these projects are included in Figure 9. Observations indicate the occurrence of overruns in about 80% of the investments in this group. Figure 7: Box plots for the residential building group (M). Dots in the figure are individual measurements. In almost all the projects studied, deviations occurred on both the overrun and savings sides. One investment showed significant variation in CPI values. Seven projects showed overspendings of the financial contingency level. In five cases, median analysis showed that more than half of the results obtained exceeded the adopted financial contingency level of 0.97. The group that includes shopping centres (G) is represented by eight developments. Box plots developed based on CPI values for these ventures are included in Figure 10. Observation of the plots showed that five ventures did not exceed the planned cost, and the measured deviations were on the side of savings. Three ventures exceeded the financial contingency threshold of 0.97.