vDataFrame.describe¶

In [ ]:

vDataFrame.describe(method: str = "auto", 
                    columns: list = [], 
                    unique: bool = True,
                    ncols_block: int = 20,
                    processes: int = 1,)

Aggregates the vDataFrame using multiple statistical aggregations (min, max, median, unique, etc.) depending on the types of the vColumns.

Parameters¶

Name	Type	Optional	Description
method	str	✓	The describe method. all : Aggregates all statistics for all vColumns. The exact method depends on the vColumn type (numerical datatype: numerical; timestamp datatype: range; categorical datatype: length). auto : Sets the method to 'numerical' if at least one vColumn of the vDataFrame is numerical and uses 'categorical' otherwise. categorical : Only uses categorical aggregations during the computation. length : Aggregates the vDataFrame using numerical aggregation on the length of all the selected vcolumns. numerical : Only uses numerical descriptive statistics. These are computed more quickly than with the 'aggregate' method. range : Aggregates the vDataFrame using multiple statistical aggregations (min, max, range, etc.). statistics : Aggregates the vDataFrame using multiple statistical aggregations (kurtosis, skewness, min, max, etc.).
columns	list	✓	List of the vcolumns names. If empty, the vcolumns will be selected depending on the parameter 'method'.
unique	bool	✓	If set to True, the cardinality of each element will be computed.
ncols_block	int	✓	The number of columns used per query. Setting this parameter divides what would otherwise be one large query into many smaller queries called "blocks," the size of which is determined by the ncols_block parameter.
processes	int	✓	Number of child processes to create. Setting this with the ncols_block parameter lets you parallelize a single query into many smaller queries, where each child process creates its own connection to the database and sends one query. This can improve query performance, but consumes more resources. If processes is set to 1, the queries are sent iteratively from a single process.

Returns¶

tablesample : An object containing the result. For more information, see utilities.tablesample.

Example¶

In [1]:

from verticapy.datasets import load_titanic
titanic = load_titanic()
display(titanic)

	123 pclass Int	123 survived Int	Abc Varchar(164)	Abc sex Varchar(20)	123 age Numeric(6,3)	123 sibsp Int	123 parch Int	Abc ticket Varchar(36)	123 fare Numeric(10,5)	Abc cabin Varchar(30)	Abc embarked Varchar(20)	Abc boat Varchar(100)	123 body Int	Abc home.dest Varchar(100)
1	1	0		female	2.0	1	2	113781	151.55	C22 C26	S	[null]	[null]	Montreal, PQ / Chesterville, ON
2	1	0		male	30.0	1	2	113781	151.55	C22 C26	S	[null]	135	Montreal, PQ / Chesterville, ON
3	1	0		female	25.0	1	2	113781	151.55	C22 C26	S	[null]	[null]	Montreal, PQ / Chesterville, ON
4	1	0		male	39.0	0	0	112050	0.0	A36	S	[null]	[null]	Belfast, NI
5	1	0		male	71.0	0	0	PC 17609	49.5042	[null]	C	[null]	22	Montevideo, Uruguay
6	1	0		male	47.0	1	0	PC 17757	227.525	C62 C64	C	[null]	124	New York, NY
7	1	0		male	[null]	0	0	PC 17318	25.925	[null]	S	[null]	[null]	New York, NY
8	1	0		male	24.0	0	1	PC 17558	247.5208	B58 B60	C	[null]	[null]	Montreal, PQ
9	1	0		male	36.0	0	0	13050	75.2417	C6	C	A	[null]	Winnipeg, MN
10	1	0		male	25.0	0	0	13905	26.0	[null]	C	[null]	148	San Francisco, CA
11	1	0		male	45.0	0	0	113784	35.5	T	S	[null]	[null]	Trenton, NJ
12	1	0		male	42.0	0	0	110489	26.55	D22	S	[null]	[null]	London / Winnipeg, MB
13	1	0		male	41.0	0	0	113054	30.5	A21	S	[null]	[null]	Pomeroy, WA
14	1	0		male	48.0	0	0	PC 17591	50.4958	B10	C	[null]	208	Omaha, NE
15	1	0		male	[null]	0	0	112379	39.6	[null]	C	[null]	[null]	Philadelphia, PA
16	1	0		male	45.0	0	0	113050	26.55	B38	S	[null]	[null]	Washington, DC
17	1	0		male	[null]	0	0	113798	31.0	[null]	S	[null]	[null]	[null]
18	1	0		male	33.0	0	0	695	5.0	B51 B53 B55	S	[null]	[null]	New York, NY
19	1	0		male	28.0	0	0	113059	47.1	[null]	S	[null]	[null]	Montevideo, Uruguay
20	1	0		male	17.0	0	0	113059	47.1	[null]	S	[null]	[null]	Montevideo, Uruguay
21	1	0		male	49.0	0	0	19924	26.0	[null]	S	[null]	[null]	Ascot, Berkshire / Rochester, NY
22	1	0		male	36.0	1	0	19877	78.85	C46	S	[null]	172	Little Onn Hall, Staffs
23	1	0		male	46.0	1	0	W.E.P. 5734	61.175	E31	S	[null]	[null]	Amenia, ND
24	1	0		male	[null]	0	0	112051	0.0	[null]	S	[null]	[null]	Liverpool, England / Belfast
25	1	0		male	27.0	1	0	13508	136.7792	C89	C	[null]	[null]	Los Angeles, CA
26	1	0		male	[null]	0	0	110465	52.0	A14	S	[null]	[null]	Stoughton, MA
27	1	0		male	47.0	0	0	5727	25.5875	E58	S	[null]	[null]	Victoria, BC
28	1	0		male	37.0	1	1	PC 17756	83.1583	E52	C	[null]	[null]	Lakewood, NJ
29	1	0		male	[null]	0	0	113791	26.55	[null]	S	[null]	[null]	Roachdale, IN
30	1	0		male	70.0	1	1	WE/P 5735	71.0	B22	S	[null]	269	Milwaukee, WI
31	1	0		male	39.0	1	0	PC 17599	71.2833	C85	C	[null]	[null]	New York, NY
32	1	0		male	31.0	1	0	F.C. 12750	52.0	B71	S	[null]	[null]	Montreal, PQ
33	1	0		male	50.0	1	0	PC 17761	106.425	C86	C	[null]	62	Deephaven, MN / Cedar Rapids, IA
34	1	0		male	39.0	0	0	PC 17580	29.7	A18	C	[null]	133	Philadelphia, PA
35	1	0		female	36.0	0	0	PC 17531	31.6792	A29	C	[null]	[null]	New York, NY
36	1	0		male	[null]	0	0	PC 17483	221.7792	C95	S	[null]	[null]	[null]
37	1	0		male	30.0	0	0	113051	27.75	C111	C	[null]	[null]	New York, NY
38	1	0		male	19.0	3	2	19950	263.0	C23 C25 C27	S	[null]	[null]	Winnipeg, MB
39	1	0		male	64.0	1	4	19950	263.0	C23 C25 C27	S	[null]	[null]	Winnipeg, MB
40	1	0		male	[null]	0	0	113778	26.55	D34	S	[null]	[null]	Westcliff-on-Sea, Essex
41	1	0		male	[null]	0	0	112058	0.0	B102	S	[null]	[null]	[null]
42	1	0		male	37.0	1	0	113803	53.1	C123	S	[null]	[null]	Scituate, MA
43	1	0		male	47.0	0	0	111320	38.5	E63	S	[null]	275	St Anne's-on-Sea, Lancashire
44	1	0		male	24.0	0	0	PC 17593	79.2	B86	C	[null]	[null]	[null]
45	1	0		male	71.0	0	0	PC 17754	34.6542	A5	C	[null]	[null]	New York, NY
46	1	0		male	38.0	0	1	PC 17582	153.4625	C91	S	[null]	147	Winnipeg, MB
47	1	0		male	46.0	0	0	PC 17593	79.2	B82 B84	C	[null]	[null]	New York, NY
48	1	0		male	[null]	0	0	113796	42.4	[null]	S	[null]	[null]	[null]
49	1	0		male	45.0	1	0	36973	83.475	C83	S	[null]	[null]	New York, NY
50	1	0		male	40.0	0	0	112059	0.0	B94	S	[null]	110	[null]
51	1	0		male	55.0	1	1	12749	93.5	B69	S	[null]	307	Montreal, PQ
52	1	0		male	42.0	0	0	113038	42.5	B11	S	[null]	[null]	London / Middlesex
53	1	0		male	[null]	0	0	17463	51.8625	E46	S	[null]	[null]	Brighton, MA
54	1	0		male	55.0	0	0	680	50.0	C39	S	[null]	[null]	London / Birmingham
55	1	0		male	42.0	1	0	113789	52.0	[null]	S	[null]	38	New York, NY
56	1	0		male	[null]	0	0	PC 17600	30.6958	[null]	C	14	[null]	New York, NY
57	1	0		female	50.0	0	0	PC 17595	28.7125	C49	C	[null]	[null]	Paris, France New York, NY
58	1	0		male	46.0	0	0	694	26.0	[null]	S	[null]	80	Bennington, VT
59	1	0		male	50.0	0	0	113044	26.0	E60	S	[null]	[null]	London
60	1	0		male	32.5	0	0	113503	211.5	C132	C	[null]	45	[null]
61	1	0		male	58.0	0	0	11771	29.7	B37	C	[null]	258	Buffalo, NY
62	1	0		male	41.0	1	0	17464	51.8625	D21	S	[null]	[null]	Southington / Noank, CT
63	1	0		male	[null]	0	0	113028	26.55	C124	S	[null]	[null]	Portland, OR
64	1	0		male	[null]	0	0	PC 17612	27.7208	[null]	C	[null]	[null]	Chicago, IL
65	1	0		male	29.0	0	0	113501	30.0	D6	S	[null]	126	Springfield, MA
66	1	0		male	30.0	0	0	113801	45.5	[null]	S	[null]	[null]	London / New York, NY
67	1	0		male	30.0	0	0	110469	26.0	C106	S	[null]	[null]	Brockton, MA
68	1	0		male	19.0	1	0	113773	53.1	D30	S	[null]	[null]	New York, NY
69	1	0		male	46.0	0	0	13050	75.2417	C6	C	[null]	292	Vancouver, BC
70	1	0		male	54.0	0	0	17463	51.8625	E46	S	[null]	175	Dorchester, MA
71	1	0		male	28.0	1	0	PC 17604	82.1708	[null]	C	[null]	[null]	New York, NY
72	1	0		male	65.0	0	0	13509	26.55	E38	S	[null]	249	East Bridgewater, MA
73	1	0		male	44.0	2	0	19928	90.0	C78	Q	[null]	230	Fond du Lac, WI
74	1	0		male	55.0	0	0	113787	30.5	C30	S	[null]	[null]	Montreal, PQ
75	1	0		male	47.0	0	0	113796	42.4	[null]	S	[null]	[null]	Washington, DC
76	1	0		male	37.0	0	1	PC 17596	29.7	C118	C	[null]	[null]	Brooklyn, NY
77	1	0		male	58.0	0	2	35273	113.275	D48	C	[null]	122	Lexington, MA
78	1	0		male	64.0	0	0	693	26.0	[null]	S	[null]	263	Isle of Wight, England
79	1	0		male	65.0	0	1	113509	61.9792	B30	C	[null]	234	Providence, RI
80	1	0		male	28.5	0	0	PC 17562	27.7208	D43	C	[null]	189	?Havana, Cuba
81	1	0		male	[null]	0	0	112052	0.0	[null]	S	[null]	[null]	Belfast
82	1	0		male	45.5	0	0	113043	28.5	C124	S	[null]	166	Surbiton Hill, Surrey
83	1	0		male	23.0	0	0	12749	93.5	B24	S	[null]	[null]	Montreal, PQ
84	1	0		male	29.0	1	0	113776	66.6	C2	S	[null]	[null]	Isleworth, England
85	1	0		male	18.0	1	0	PC 17758	108.9	C65	C	[null]	[null]	Madrid, Spain
86	1	0		male	47.0	0	0	110465	52.0	C110	S	[null]	207	Worcester, MA
87	1	0		male	38.0	0	0	19972	0.0	[null]	S	[null]	[null]	Rotterdam, Netherlands
88	1	0		male	22.0	0	0	PC 17760	135.6333	[null]	C	[null]	232	[null]
89	1	0		male	[null]	0	0	PC 17757	227.525	[null]	C	[null]	[null]	[null]
90	1	0		male	31.0	0	0	PC 17590	50.4958	A24	S	[null]	[null]	Trenton, NJ
91	1	0		male	[null]	0	0	113767	50.0	A32	S	[null]	[null]	Seattle, WA
92	1	0		male	36.0	0	0	13049	40.125	A10	C	[null]	[null]	Winnipeg, MB
93	1	0		male	55.0	1	0	PC 17603	59.4	[null]	C	[null]	[null]	New York, NY
94	1	0		male	33.0	0	0	113790	26.55	[null]	S	[null]	109	London
95	1	0		male	61.0	1	3	PC 17608	262.375	B57 B59 B63 B66	C	[null]	[null]	Haverford, PA / Cooperstown, NY
96	1	0		male	50.0	1	0	13507	55.9	E44	S	[null]	[null]	Duluth, MN
97	1	0		male	56.0	0	0	113792	26.55	[null]	S	[null]	[null]	New York, NY
98	1	0		male	56.0	0	0	17764	30.6958	A7	C	[null]	[null]	St James, Long Island, NY
99	1	0		male	24.0	1	0	13695	60.0	C31	S	[null]	[null]	Huntington, WV
100	1	0		male	[null]	0	0	113056	26.0	A19	S	[null]	[null]	Streatham, Surrey

Rows: 1-100 | Columns: 14

In [2]:

# All statistics
titanic.describe(method = "all")

Out[2]:

	123 "pclass" Int 100%	123 "survived" Int 100%	123 "age" Numeric(6,3) 80%	123 "sibsp" Int 100%	123 "parch" Int 100%	123 "fare" Numeric(10,5) 99%	123 "body" Int 9%	Abc "name" Varchar(164) 100%	Abc "sex" Varchar(20) 100%	Abc "ticket" Varchar(36) 100%	Abc "cabin" Varchar(30) 23%	Abc "embarked" Varchar(20) 99%	Abc "boat" Varchar(100) 35%	Abc "home.dest" Varchar(100) 57%
dtype	int	int	numeric(6,3)	int	int	numeric(10,5)	int	varchar(164)	varchar(20)	varchar(36)	varchar(30)	varchar(20)	varchar(100)	varchar(100)
percent	100.0	100.0	80.794	100.0	100.0	99.919	9.562	100.0	100.0	100.0	23.177	99.838	35.575	57.212
count	1234	1234	997	1234	1234	1233	118	1234	1234	1234	286	1232	439	706
top	3	0	[null]	0	0	8.05	[null]	Kelly, Mr. James	male	CA. 2343	[null]	S	[null]	[null]
top_percent	53.728	63.533	19.206	67.747	76.904	4.7	90.438	0.162	65.964	0.81	76.823	70.746	64.425	42.788
avg	2.28444084278768	0.364667747163695	30.1524573721163	0.504051863857374	0.378444084278768	33.9637936739659	164.14406779661	26.5145867098865	4.6807131280389	6.80470016207455	3.72027972027972	1.0	1.47380410022779	19.0453257790368
stddev	0.842485636190292	0.481532018641288	14.4353046299159	1.04111727241629	0.868604707790392	52.6460729831293	96.5760207557808	9.18337285171824	0.948042321667023	2.80249175697261	2.28313602243069	0.0	0.63650147361905	8.83212620482592
min	1	0	0.33	0	0	0.0	1	12	4	3	1	1	1	5
approx_25%	1.0	0.0	21.0	0.0	0.0	7.8958	79.25	20	4	5	3	1	1	12
approx_50%	3.0	0.0	28.0	0.0	0.0	14.4542	160.5	25	4	6	3	1	1	17
approx_75%	3.0	1.0	39.0	1.0	0.0	31.3875	257.5	30	6	7	3	1	2	25
max	3	1	80.0	8	9	512.3292	328	82	6	18	15	1	7	50
range	2	1	79.67	8	9	512.3292	327	70	2	15	14	0	6	45
empty	[null]	[null]	[null]	[null]	[null]	[null]	[null]	0	0	0	0	0	0	0

Rows: 1-14 | Columns: 15

In [3]:

# Categorical 
titanic.describe(method = "categorical")

Out[3]:

	dtype	count	top	top_percent
"pclass"	int	1234	3	53.728
"survived"	int	1234	0	63.533
"name"	varchar(164)	1234	Kelly, Mr. James	0.162
"sex"	varchar(20)	1234	male	65.964
"age"	numeric(6,3)	997	[null]	19.206
"sibsp"	int	1234	0	67.747
"parch"	int	1234	0	76.904
"ticket"	varchar(36)	1234	CA. 2343	0.81
"fare"	numeric(10,5)	1233	8.05	4.7
"cabin"	varchar(30)	286	[null]	76.823
"embarked"	varchar(20)	1232	S	70.746
"boat"	varchar(100)	439	[null]	64.425
"body"	int	118	[null]	90.438
"home.dest"	varchar(100)	706	[null]	42.788

Rows: 1-14 | Columns: 5

In [4]:

# Length
titanic.describe(method = "length")

Out[4]:

	dtype	percent	count	empty	avg_length	stddev_length	min_length	25%_length	50%_length	75%_length	max_length
"pclass"	int	100	1234	0	1.0	0.0	1	1	1	1	1
"survived"	int	100	1234	0	1.0	0.0	1	1	1	1	1
"name"	varchar(164)	100	1234	0	26.5145867098865	9.18337285171824	12	20	25	30	82
"sex"	varchar(20)	100	1234	0	4.6807131280389	0.948042321667023	4	4	4	6	6
"age"	numeric(6,3)	80.794	997	0	5.92577733199599	0.262264471822663	5	6	6	6	6
"sibsp"	int	100	1234	0	1.0	0.0	1	1	1	1	1
"parch"	int	100	1234	0	1.0	0.0	1	1	1	1	1
"ticket"	varchar(36)	100	1234	0	6.80470016207455	2.80249175697261	3	5	6	7	18
"fare"	numeric(10,5)	99.919	1233	0	7.69180859691809	0.590019306054422	7	7	8	8	9
"cabin"	varchar(30)	23.177	286	0	3.72027972027972	2.28313602243069	1	3	3	3	15
"embarked"	varchar(20)	99.838	1232	0	1.0	0.0	1	1	1	1	1
"boat"	varchar(100)	35.575	439	0	1.47380410022779	0.63650147361905	1	1	1	2	7
"body"	int	9.562	118	0	2.66101694915254	0.542553931827095	1	2	3	3	3
"home.dest"	varchar(100)	57.212	706	0	19.0453257790368	8.83212620482592	5	12	17	25	50

Rows: 1-14 | Columns: 12

In [5]:

# Numerical
titanic.describe(method = "numerical")

Out[5]:

	count	mean	std	min	approx_25%	approx_50%	approx_75%	max
"pclass"	1234	2.28444084278768	0.842485636190292	1	1	3	3	3
"survived"	1234	0.364667747163695	0.481532018641288	0	0	0	1	1
"age"	997	30.1524573721163	14.4353046299159	0.33	21	28	39	80
"sibsp"	1234	0.504051863857374	1.04111727241629	0	0	0	1	8
"parch"	1234	0.378444084278768	0.868604707790392	0	0	0	0	9
"fare"	1233	33.9637936739659	52.6460729831293	0	7.8958	14.4542	31.3875	512.3292
"body"	118	164.14406779661	96.5760207557808	1	79.25	160.5	257.5	328

Rows: 1-7 | Columns: 9

In [6]:

# Range
titanic.describe(method = "range")

Out[6]:

	dtype	percent	count	min	max	range
"pclass"	int	100	1234	1	3	2
"survived"	int	100	1234	0	1	1
"age"	numeric(6,3)	80.794	997	0.33	80	79.67
"sibsp"	int	100	1234	0	8	8
"parch"	int	100	1234	0	9	9
"fare"	numeric(10,5)	99.919	1233	0	512.3292	512.3292
"body"	int	9.562	118	1	328	327

Rows: 1-7 | Columns: 7

In [7]:

# Statistics
titanic.describe(method = "statistics")

Out[7]:

	dtype	percent	count	avg