causes of data loss
Bullding tables of data
Ngày tải lên :
03/10/2013, 00:20
... unnamedTable = new System .Data. DataTable();
System .Data. DataTable namedTable = new System .Data. DataTable("Customer");
Visual Basic
Dim unnamedTable As New System .Data. DataTable()
Dim namedTable ... tabular data as a collection of collections. Each
DataTable object contains a collection of ordered rows, each existing as an instance of a
DataRow object. Each row contains its own collection of ... is the process of crafting tables that ensure data integrity and take
advantage of the processing power of relational database systems. E.F. Codd, inventor
of the relational database model,...
- 20
- 330
- 0
Statistical Description of Data part 1
Ngày tải lên :
20/10/2013, 17:15
... tendency, the moments of
a distribution, the median and mode. In §14.2 we learn to test whether different data
sets are drawn from distributions with different values of these measures of central
tendency. ... of integer powers
of the values.
Best known is the mean of the values x
1
, ,x
N
,
x=
1
N
N
j=1
x
j
(14.1.1)
which estimates the value around which central clustering occurs. Note the use of
an ... 610
Chapter 14. Statistical Description of Data
Sample page from NUMERICAL RECIPES IN C: THE ART OF SCIENTIFIC COMPUTING (ISBN 0-521-43108-5)
Copyright (C) 1988-1992...
- 2
- 267
- 0
Statistical Description of Data part 2
Ngày tải lên :
24/10/2013, 15:15
... tendency, the moments of
a distribution,the median and mode. In §14.2 we learn to test whether different data
sets are drawn from distributions with different values of these measures of central
tendency. ... of integer powers
of the values.
Best known is the mean of the values x
1
, ,x
N
,
x=
1
N
N
j=1
x
j
(14.1.1)
which estimates the value around which central clustering occurs. Note the use of
an ... the mean is not the only available estimator of this
614
Chapter 14. Statistical Description of Data
Sample page from NUMERICAL RECIPES IN C: THE ART OF SCIENTIFIC COMPUTING (ISBN 0-521-43108-5)
Copyright...
- 6
- 301
- 0
Statistical Description of Data part 3
Ngày tải lên :
24/10/2013, 15:15
... makes use of the following routine for computing the mean and variance
of a set of numbers,
620
Chapter 14. Statistical Description of Data
Sample page from NUMERICAL RECIPES IN C: THE ART OF SCIENTIFIC ... routine
void ftest(float data1 [], unsigned long n1, float data2 [], unsigned long n2,
float *f, float *prob)
Given the arrays
data1 [1 n1]
and
data2 [1 n2]
, this routine returns the value of
f
,and
its significance ... 1 degrees of freedom.
The routine is
#include <math.h>
void tptest(float data1 [], float data2 [], unsigned long n, float *t,
float *prob)
Given the paired arrays
data1 [1 n]
and
data2 [1 n]
,...
- 6
- 372
- 0
Statistical Description of Data part 4
Ngày tải lên :
28/10/2013, 22:15
... the data sets are
drawn from the same distribution. Small values of
prob
show that the cumulative distribution
function of
data1
is significantly different from that of
data2
. The arrays
data1
and
data2
are ... number of data points, N
e
= N for the case (14.3.5)
of one distribution, and
N
e
=
N
1
N
2
N
1
+ N
2
(14.3.10)
for the case (14.3.6) of two distributions, where N
1
is the number of data points ... consider the case of comparing two binned data sets. Let R
i
be the
number of events in bin i for the first data set, S
i
the number of events in the same
bin i for the second data set. Then the...
- 9
- 334
- 0
Statistical Description of Data part 5
Ngày tải lên :
28/10/2013, 22:15
... . .
1.
red
# of
red males
N
11
# of
red females
N
21
# of
green females
N
22
# of
green males
N
12
# of
males
N
1
⋅
# of
females
N
2
⋅
2.
green
# of red
N
⋅
1
# of green
N
⋅
2
total ... number of degrees of freedom is equal to the number of entries in the table
(product of its row size and column size) minus the number of constraints that have
arisen from our use of the data themselves ... since the total of the
column totals and the total of the row totals both equal N, the total number of data
points. Therefore, if the table is of size I by J, the number of degrees of freedom is
IJ...
- 9
- 307
- 0
Statistical Description of Data part 6
Ngày tải lên :
07/11/2013, 19:15
... respectively, the number of data points in the measurement of r
1
and r
2
.
All of the significances above are two-sided. If you wish to disprove the null
hypothesis in favor of a one-sided hypothesis, ... is the mean of the x
i
’s, y is the mean of the y
i
’s.
The value of r lies between −1 and 1, inclusive. It takes on a value of 1,termed
“complete positive correlation,” when the data points ... detecting correlation between uniform
sets of integers between 1 and N, keeping in mind the possibilityof ties in the ranks.
There is, of course, some loss of information in replacing the original...
- 4
- 308
- 0
Statistical Description of Data part 7
Ngày tải lên :
07/11/2013, 19:15
... relative ordering
of the ranks of the two x’s is opposite from the relative ordering of the ranks of the
two y’s. If there is a tie in either the ranks of the two x’s or the ranks of the two
y’s, ... kendl1(float data1 [], float data2 [], unsigned long n, float *tau,
float *z, float *prob)
Given data arrays
data1 [1 n]
and
data2 [1 n]
, this program returns Kendall’s τ as
tau
,
its number of standard ... "nrutil.h"
void spear(float data1 [], float data2 [], unsigned long n, float *d, float *zd,
float *probd, float *rs, float *probrs)
Given two data arrays,
data1 [1 n]
and
data2 [1 n]
, this routine...
- 7
- 360
- 0
Statistical Description of Data part 8
Ngày tải lên :
07/11/2013, 19:15
... difference (ranging both over data points and over quadrants) of the
corresponding integrated probabilities. When comparing two data sets, the value of D may
depend on which data set is ranged over. ... tabulate Monte Carlo results for (what amounts to) the
distribution of D as a function of (of course) D,samplesizeN, and coefficient of correlation
r. Analyzing their results, one finds that the significance ... number of points as the real data set. Compute D for each
synthetic data set, using the accompanying computer routines (but ignoring their calculated
probabilities), and count what fraction of the...
- 6
- 309
- 0
Tài liệu Introduction for the security : Networks and exchanges of data Computer security The risks ppt
Ngày tải lên :
09/12/2013, 17:22
... ?
Introduction for the security
Networks and exchanges of data
Computer security
The risks
Networks and exchanges of data
For the exchange of the data, we've changed the technology
The ... and exchanges of data
The connection between Internet and the company's
network open a large way with a lot of persons. They
can use this solution and they obtain a lot of services.
But ... :
Data shared with the clients and the partners
Propose different services
Profitability
The agenda
Introduction for the security
Networks and exchanges of data
Computer...
- 5
- 569
- 0
Tài liệu ADC KRONE - White Paper - Data Center - 3 principles of Data Center Infrastructure Design (with n pptx
Ngày tải lên :
10/12/2013, 03:15
... life
of your data center.
The Three Principles of Data Center Infrastructure Design
Page 7
Deployment
The graphic below depicts a sample data center using ADC's comprehensive line of data ... Category 6
Page 3
The Three Principles of Data
Center Design
When you understand the three principles of data center
design, you are able to:
• Lower your total cost of ownership
• Support your future ... outside world,
huge streams of data are transferred to and from
equipment areas at extremely high data rates. The
infrastructure must consistently support the flow of data
without errors that...
- 8
- 523
- 0
Tài liệu overview of data modeling and database design pptx
Ngày tải lên :
10/12/2013, 17:15
... the data model. Modify the data model to support
different functional requirements and alternate database designs by normalizing the
storage of data before you create the database.
Benefits of ... information, see
Develop Complex Data Models and Design Databases course description.
Overview of Data Modeling and Database Design 8Ć9
Database Design
Designing a relational database system involves ... non-UID attribute.
Overview of Data Modeling and Database Design 8Ć29
Designing the Database
The database design stage produces design specifications for a relational database,
including definitions...
- 40
- 651
- 0
Tài liệu Statistical Description of Data part 9 pptx
Ngày tải lên :
15/12/2013, 04:15
... 900
Figure 14.8.1. Top: Synthetic noisy data consisting of a sequence of progressively narrower bumps,
and additive Gaussian white noise. Center: Result of smoothing the data by a simple moving window
average. ... window
average. One seesthat the window of width 33 does quite a nicejob of smoothing the broadest
bump, but that the narrower bumps suffer considerable loss of height and increase of width.
The underlying ... synthetic data. Bottom: Result of smoothing the data by a Savitzky-Golay
smoothing filter (of degree 4) using the same 33 points. While there is less smoothing of the broadest
feature, narrower...
- 6
- 407
- 0
Tài liệu Modeling of Data part 1 pptx
Ngày tải lên :
15/12/2013, 04:15
... measure of goodness -of- fit. When the third item suggests that the model
is an unlikely match to the data, then items (i) and (ii) are probably worthless.
Unfortunately, many practitioners of parameter ... graph of data and model “looks good.” This
approach is known as chi-by-eye. Luckily, its practitioners get what they deserve.
CITED REFERENCES AND FURTHER READING:
Bevington, P.R. 1969,
Data Reduction ... based on? The answer
to these questions takes us into the subject of maximum likelihood estimators.
Given a particular data set of x
i
’s and y
i
’s, we have the intuitive feeling that
some parameter...
- 2
- 391
- 0
Tài liệu Modeling of Data part 2 doc
Ngày tải lên :
15/12/2013, 04:15
... [1]
15.2 Fitting Data to a Straight Line
A concrete example will make the considerations of the previous section more
meaningful. We consider the problem of fitting a set of N data points (x
i
,y
i
)to
a ... 68 percent of the time, within ±2σ 95 percent
of the time, and within ±3σ 99.7 percent of the time. Extending this, one would
expect a measurement to be off by ±20σ only one time out of 2 × 10
88
.Weall
know ... that the
standard deviations σ of these normal distributionsare the same for all points. Then
the probability of the data set is the product of the probabilities of each point,
P ∝
N
i=1
exp
−
1
2
y
i
−...
- 5
- 381
- 0
