epogrebnyak/lamps.csv

## lamps.csv

          
            i
            h
            f
            K

            
              0
              0
              0
              50

            
              1
              840
              2
              48

            
              2
              852
              1
              47

            
              3
              936
              1
              46

            
              4
              960
              1
              45

            
              5
              972
              1
              44

            
              6
              996
              1
              43

            
              7
              1008
              1
              42

            
              8
              1032
              2
              40

            
              9
              1104
              1
              39

            
              10
              1176
              5
              34

            
              11
              1200
              1
              33

            
              12
              1260
              1
              32

            
              13
              1296
              1
              31

            
              14
              1308
              1
              30

            
              15
              1332
              2
              28

            
              16
              1356
              1
              27

            
              17
              1380
              1
              26

            
              18
              1416
              1
              25

            
              19
              1476
              2
              23

            
              20
              1524
              3
              20

            
              21
              1548
              3
              17

            
              22
              1560
              1
              16

            
              23
              1632
              1
              15

            
              24
              1644
              2
              13

            
              25
              1656
              2
              11

            
              26
              1716
              5
              6

            
              27
              1764
              1
              5

            
              28
              1812
              1
              4

            
              29
              1836
              1
              3

            
              30
              1860
              1
              2

            
              31
              1980
              1
              1

            
              32
              2568
              1
              0

## lamps.py
# Lamps survival graph from Menon and Agrawal (2007)
from pandas import pd
df = pd.read_csv("https://bit.ly/2FleDbZ", index_col=0)
df.plot(x="h", y="K", title="Survival graph, 50 lightbulbs")

## lamps.txt
Dataset from:

V.J. Menon and D.C. Agrawal,  Renewal Rate of Filament Lamps:
Theory and Experiment. Journal of Failure Analysis and Prevention.
December 2007, p. 421, Table 2/
DOI: 10.1007/s11668-007-9074-9

Description:

An assembly of 50 new Philips (India) lamps with the
rating 40 W, 220 V (AC) was taken and installed in the horizontal
orientation and uniformly distributed over a lab area 11 m 9 7 m.

The assembly was monitored at regular intervals of 12 h to
look for failures. The instants of recorded failures were
called t‘ and a total of 32 data points were obtained such
that even the last bulb failed.

Variables:

i - observation number
h - time in hours since experiment start
f - number of failed lamps at particular time h
K - number of surviving lamps  at particular time h

Short URL:

https://bit.ly/2FleDbZ
i	h	f	K
0	0	0	50
1	840	2	48
2	852	1	47
3	936	1	46
4	960	1	45
5	972	1	44
6	996	1	43
7	1008	1	42
8	1032	2	40
9	1104	1	39
10	1176	5	34
11	1200	1	33
12	1260	1	32
13	1296	1	31
14	1308	1	30
15	1332	2	28
16	1356	1	27
17	1380	1	26
18	1416	1	25
19	1476	2	23
20	1524	3	20
21	1548	3	17
22	1560	1	16
23	1632	1	15
24	1644	2	13
25	1656	2	11
26	1716	5	6
27	1764	1	5
28	1812	1	4
29	1836	1	3
30	1860	1	2
31	1980	1	1
32	2568	1	0
	# Lamps survival graph from Menon and Agrawal (2007)
	from pandas import pd
	df = pd.read_csv("https://bit.ly/2FleDbZ", index_col=0)
	df.plot(x="h", y="K", title="Survival graph, 50 lightbulbs")
	Dataset from:

	V.J. Menon and D.C. Agrawal, Renewal Rate of Filament Lamps:
	Theory and Experiment. Journal of Failure Analysis and Prevention.
	December 2007, p. 421, Table 2/
	DOI: 10.1007/s11668-007-9074-9

	Description:

	An assembly of 50 new Philips (India) lamps with the
	rating 40 W, 220 V (AC) was taken and installed in the horizontal
	orientation and uniformly distributed over a lab area 11 m 9 7 m.

	The assembly was monitored at regular intervals of 12 h to
	look for failures. The instants of recorded failures were
	called t‘ and a total of 32 data points were obtained such
	that even the last bulb failed.

	Variables:

	i - observation number
	h - time in hours since experiment start
	f - number of failed lamps at particular time h
	K - number of surviving lamps at particular time h

	Short URL:

	https://bit.ly/2FleDbZ