WikiEnergy Data Set Statistics

I recently wrote a post about the WikiEnergy data set released by Pecan Street Inc, and have since written a downloader and converter for the data set as part of NILMTK. In total, the data set contains 71 feed feeds monitored across 239 buildings over the period 1 Jan 2014 - 31 May 2014. However, only a subset of feeds were monitored for each building, and many buildings were not monitored for the full 5 months. This post provides a bit more insight into the content of the data set at the time of writing.

Feeds per building:

The histogram below shows the number of feeds monitored in each of the 239 buildings. It can be seen that the mode of the distribution is around 12 feeds per building, and therefore most of these buildings will be useful for evaluation energy disaggregation approaches.

Duration per building:

The histogram below shows the number of months for which each of the 239 buildings were monitored. It can be seen that vast majority of buildings were monitored for the full 5 months, while the remaining buildings were distributed between 1-4 months. However, this distribution will change dramatically once data for 2012-2013 is released.

Percentage energy sub-metered:

The histogram below shows the percentage of energy sub-metered in 235 of the 239 buildings. The remaining 4 buildings appeared to have energy sub-metered greater than 100%, and were therefore excluded from this plot. This distribution has two distinct peaks; one centred around 70% and another which peaks around 5%. The 63 buildings for which less than 40% of the energy was sub-metered are likely to be of limited use for evaluating energy disaggregation methods.

Buildings per feed:

The table below shows the number of buildings in which each of the 71 feeds were present. A description of each of the feeds is available from the Wiki-Energy Knowledge Base. It can be seen that the presence of feeds in buildings is quite sparse. However, the following feeds are present in the majority of buildings: the household aggregate power (use), air conditioning (air1), washing machine (clotheswasher1), dishwasher (dishwasher1), clothes dryer (drye1), electric heating (furnace1) and refrigerator (refrigerator1).

Feed	Buildings
use	239
air1	224
air2	38
air3	5
airwindowunit1	3
aquarium1	1
bathroom1	57
bathroom2	7
bedroom1	65
bedroom2	30
bedroom3	4
bedroom4	0
bedroom5	0
car1	62
clotheswasher1	133
clotheswasher_dryg1	28
diningroom1	20
diningroom2	1
dishwasher1	150
disposal1	85
drye1	141
dryg1	29
freezer1	13
furnace1	184
furnace2	29
garage1	25
garage2	3
gen	116
grid	0
heater1	2
housefan1	2
icemaker1	1
jacuzzi1	13
kitchen1	46
kitchen2	17
kitchenapp1	103
kitchenapp2	73
lights_plugs1	79
lights_plugs2	40
lights_plugs3	16
lights_plugs4	4
lights_plugs5	2
lights_plugs6	0
livingroom1	64
livingroom2	10
microwave1	113
office1	31
outsidelights_plugs1	16
outsidelights_plugs2	3
oven1	89
oven2	3
pool1	4
pool2	0
poollight1	2
poolpump1	17
pump1	3
range1	61
refrigerator1	164
refrigerator2	14
security1	7
shed1	3
sprinkler1	9
unknown1	16
unknown2	6
unknown3	1
unknown4	1
utilityroom1	5
venthood1	19
waterheater1	21
waterheater2	2
winecooler1	4