*3.1. Description—The Training Dataset*

The dataset used for training the regression analysis comprises approximately 350,000 observations. Figure 4 shows the collected data for the dependent variable and the total electric and thermal power consumption, plotted together with the outdoor drybulb temperature. The average power consumption for the whole dataset is approximately 16 kW and energy supply for the period is 93,000 kWh. The daily average energy use ranges from approximately 190 kWh to nearly 900 kWh, with a corresponding daily average power consumption ranging from approximately 7.9 kW to 37 kW. The registered average diurnal dry-bulb temperature ranges from −11 ◦C to 20 ◦C. During this period, nearly 2000 swimmers used the facility, equally divided between adults and youngsters/children.

Figure 4 reveals a seasonal trend, a minor dependency between the energy use and the outdoor temperature, with some spikes in energy use distributed over the period. By visual inspection, it seems that the outdoor temperature variable can explain some of the variations in energy use, but additional variables influenced the variation in daily total energy usage.
