comparing two groups of data

Ngày tải lên: 21/03/2014, 21:59

Ngày tải lên: 21/03/2014, 21:59

Ngày tải lên: 30/03/2014, 04:20

... weaning was standardized in both groups through the use of daily SBTs [11]. Data analysis The purpose of the study was to compare the time to a suc- cessful extubation in the two groups. The time to successful extubation ... longer hospital length of stay (23 versus 12 days; P = 0.01). Conclusion In our cohort of patients, the use of SA was associated with reduced duration of MV and lengths of stay compared with DIS. ... study design, data acquisition, data analysis and interpretation, and drafting of the manuscript. CG participated in study design, data analysis and interpretation, and drafting of the manuscript....

Ngày tải lên: 25/10/2012, 10:35

... *** START OF THIS PROJECT GUTENBERG EBOOK TWO LOVERS OF HEAVEN *** Produced by Dennis McCarthy THE TWO LOVERS OF HEAVEN: CHRYSANTHUS AND DARIA. A Drama of Early ... the attention of all candid readers to the remarks of the Professor of Poetry at Oxford on the 'Autos Sacramentales' of Calderon remarks founded entirely on the volume of translations ... call the region of sacred mythology, as in The Sibyl of the East, in which the profound legends identifying the Cross of Calvary and the Tree of Life are wrought up into a poem of surpassing...

Ngày tải lên: 06/11/2012, 15:30

... 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,...

Ngày tải lên: 03/10/2013, 00:20

... question of whether two distributions can be shown to be (significantly) different. In §14.4–§14.7, we deal with measures of association for two distributions. We want to determine whether two variables ... 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...

Ngày tải lên: 20/10/2013, 17:15

... question of whether two distributions can be shown to be (significantly) different. In §14.4–§14.7, we deal with measures of association for two distributions. We want to determine whether two variables ... 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...

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 ... (distribution of area in the sky, or incidence of chicken pox in the general population). Fluorescent lights and educational level involve the comparison of two equally unknown data sets (the two brands, ... 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...

Ngày tải lên: 24/10/2013, 15:15

... complement Let’s go through the actual operation of computing the checksum of the datagram we saw two slides ago. In the leftmost column, you have the hex representation of the 16-bit fields, followed by the ... TCP data by reusing sequence numbers. Different destination hosts will react differently to this type of attack by either rejecting the new data or overwriting old data. The RFCs indicate data ... not the rest of the datagram that consists of the embedded protocol header and data. 20 20 Evasion S NID destination S NID NID destination T T NID sees T Destination host sees ST Data on SYN In...

Ngày tải lên: 26/10/2013, 23:15

... you see a one byte code of 83 which represents what this IP option is – loose source routing. Next, there is another byte code of 07 which is how many bytes we have of data in the header. Actually, ... output interface. Type of service used by router to select routing path when multiple paths are available. Type of Service Bits The Type of Service (TOS) field is byte 1 of the IP header. The ... host sending out many IP datagrams in a very small amount of time. 5 5 Mutant IP Version • isic software can generate bad IP versions • Done to test the integrity of receiving host IP stack isic...

Ngày tải lên: 26/10/2013, 23:15

... 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 ... 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 ... 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...

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...

Ngày tải lên: 28/10/2013, 22:15

... send any more data. Once the receiving host has processed some of the data in the buffer, it will send a window size update to the sending host to inform it to resume sending data. Initial window ... OS. 28 28 Data Sent on SYN • Normally, 0 bytes of data sent on initial SYN connection client.com.38060 > server.com.telnet: S 3774957990:3774957990(0) win 8760 <mss 1460> (DF) • Data not ... time measurements and load balancing to offer better services. A more stealthy use of this might be to elude detection and analysis of the content of the payload that accompanies the SYN. 33 33 UDP...

Ngày tải lên: 04/11/2013, 13:15

... 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 ... concept of nonparametric correlation is this: If we replace the value of each x i by the value of its rank among all the other x i ’s in the sample, that is, 1, 2, 3, ,N, then the resulting list of...

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, then ... relative ordering of the ranks of the two x’s (or for that matter the two x’s themselves) is the same as the relative ordering of the ranks of the two y’s (or for that matter the two y’s themselves). ... "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...

Ngày tải lên: 07/11/2013, 19:15

... the real data. That fraction is your significance. One disadvantage of the two- dimensional tests, by comparison with their one- dimensional progenitors, is that the two- dimensional tests require of ... not rigorously true that the distribution of D in the null hypothesis is independent of the shape of the two- dimensional distribution. In this respect the two- dimensional K–S test is not as natural ... 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 levels for the two- dimensional K–S test...

Ngày tải lên: 07/11/2013, 19:15

Ngày tải lên: 07/12/2013, 11:33

Ngày tải lên: 07/12/2013, 11:40

... ? 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 ...   Networks 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 ... of services. But Inside an Intranet we find a lot of data and information. For the live of the company, they're critical. If in the network, the security is bad, the information can be...

Ngày tải lên: 09/12/2013, 17:22