regression analysis with dummy variables in r

... K, Singer EJ, Nagra RM, Russell JJ, Tourtellotte WW: Quantifying HIV-1 RNA using polimerase chain reaction on cerebrospinal fluid and serum of seroposi- tive individuals with and without neurologic ... writing of the manuscript. AMC was responsible for the proceedings performed in the Virology Unit, and was co-writer of the manuscript. HR was responsible for patient enrolment. AA and RN were ... of cytokines in cryptococcal meningitis may further clarify the factors that determine CSF HIV-1 viral load in this context. Third, our results are representative only of patients with meningitis...

Ngày tải lên: 20/06/2014, 08:20

Ngày tải lên: 26/11/2013, 13:31

Ngày tải lên: 20/12/2013, 18:16

... from Odorrana livida; nigrocin-2SCa, 2SCb and 2SCc are from Odorrana schmackeri; nigrocin-2VB is from Odorrana versabilis. Note that nigrocin-2LVa is of identical primary structure to nigrocin- 2N ... and structural characterization of nigrocins from reverse-phase HPLC fractions of skin secretions We previously reported our standard approach to identify and structurally characterize frog venom peptides ... cDNAs from skin secretion-derived cDNA libraries Nigrocin-2-related peptide precursor cDNAs were con- sistently cloned from each skin secretion-derived library. A single transcript was amplified from the P....

Ngày tải lên: 15/03/2014, 10:20

... assessing cognitively impaired older adults is their potential inability to perform dual-tasking properly, thereby increasing measurement error. Therefore, our objective was to determine the reliability ... dual-task performance with increase activity in prefrontal areas, cingulate, parietal and premotor areas[34,35]. Therefore, we postulate that those regions may have a control on gait in older individuals. ... individuals. In line with previous studies, our results support the hypoth- esis that occupying these areas with concurrent cognitive processing (dual-tasking) may result in a brain resource limitation...

Ngày tải lên: 19/06/2014, 08:20

... interaction term was not significant. AFS appeared to provide greater error reduction and to explain more variability in the EQ-5D index when the ACRE data were removed. Other interaction terms ... (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduc- tion in any medium, provided the original work is properly cited. Research Mapping of the EQ-5D index from clinical ... validation dataset. Forward ordinary least squares linear regression methods and measures of prediction error were used to build a model to map to the EQ-5D index. Age, sex, a proxy measure of disease...

Ngày tải lên: 20/06/2014, 16:20

... R b − R, d) − π (R b − R) 2 ) R < d ≤ R 2d πRR 2 b (1−α)( 2R 2 b − R R)   (R b , R b − R, d) −  (R b , R b − R, d)  R < d ≤ 2R b − R 2d πRR 2 b (1−α)( 2R 2 b − R R)  (R b , R b − R, d) 2R b − ... 1 ddr (13) ã For 1+ 2 R < d R : (d)= Rd 0 h1 (r) r 0 1 R l 1 d dr + dR Rd h1 (r) r 0 1 R l 1 ddr + d +R dR h1 (r) r( 1 + 1 1 R l 1 d )d r + d +R d +R h1 (r) r 0 1 R l ... 2R b (19) f D C (d)= 4d π (R b R) 2 arccos d 2 (R b R) − 4d 2 π (R b R) 4  4 (R b − R) 2 − d 2 s. t.0< d ≤ 2 · ( R b − R ) (20) where Λ (R, r, d) is given by  (R, r, d) =R 2 arccos R 2 +d 2 r 2 2dR + r 2 arccos r 2 +d 2 R 2 2dr − 1 2  ((r...

Ngày tải lên: 20/06/2014, 22:20

... number of groups increases. Since the mesh becomes more massive with the growth of members, more redundant routes are formed. In ODMRP, as the num- ber of receivers increases, the number of forwarding ... differences in the algorithms are in assigning priority between data packets. In no-priority scheduling, both control and data packets are served in FIFO order. In the priority scheduling, control ... servicing order of packets in the queue. Greedy and round-robin scheduling show little difference in performance compared to FPS. In case of greedy scheduling, looking at the performance of individual...

Ngày tải lên: 23/06/2014, 00:20

... whenever there are al- ternatives for implementing ML estimators, and reduced sensitivity to in uent observations is desired. 3. ALGORITHMS FOR INFERENCE The routines here reported were used as provided ... ground features was retrieved in an SAR image. As for future work, ML estimation of the parameters of polarimetric distributions for SAR data based on the alter- nated algorithm proposed here ... universal model for speckled imagery, this work concentrates on ML inference of the parameters of this distribution. The liter- ature reports severe numerical problems when estimating these parameters,...

Ngày tải lên: 23/06/2014, 01:20

... significantly reduced clinical scores compared R6 7 with those in untreated mice (Fig. 1). Whereas the clinical arthritis score increased progressively in the control groups, the score was less in all groups ... shown are derived from one representative from three independent experiments. *P < 0.05 versus untreated or water for injection (WFI) treated Tg197 control groups. AS, arthritis score. Introduction Rheumatoid ... patients with RA should be examined further. Competing interests This work was supported in part by a research grant from Laboratoire Medidom S.A. Dr Peter Fernandes who is a co-author in the present...

Ngày tải lên: 09/08/2014, 01:23

... breast cancers which were estrogen-receptor positive and treated by breast conserving surgery and radiotherapy, and rectal cancers which received preoperative radiotherapy. To allow us to more ... staining; 5–8, moderate staining; and 9–12, strong staining. For the purpose of statistical analysis, the cohort was grouped into tumors with negli- gible or weak staining (N = 34) versus tumors ... specifically in those with certain tumour char- acteristics and having underwent specific treatment modality. These were chiefly prostate tumors treated by radiotherapy and short-term hormonal treatment,...

Ngày tải lên: 09/08/2014, 10:20

... cause, ipsilateral recurrence was defined as recurrence of invasive or DCIS breast cancer at same breast treated by RT and contralateral breast cancer recurrence was defined as recurrence in the breast ... contralateral breast cancers occurring as first events (13 in the no fur- ther treatment group vs 19 in the radiotherapy group) were included. However, when all contralateral breast cancers were included ... cancer recurrenceFigure 6 Meta -analysis examining adjuvant radiotherapy in DCIS for patients with breast cancer: contralateral breast cancer recurrence. Publish with BioMed Central and every scientist...

Ngày tải lên: 09/08/2014, 10:21

... Dr Marilyn Suite, Dr Kim Basdeo Maharaj, Dr Leslie Roberts, Dr Deepak Mahabir, Dr Rajiv Serrano, Prof Hylton McFarlane, Dr Zinora Asgaralli, Ms Arlene Damanie, Dr Peter Poon King, Dr Richard ... miscarriage (17.6%), this misreporting might suggest that the higher pregnancy loss rate in our study could be explained by a higher proportion of induced abortion in this age group. Our findings ... giv- ing a crude SLE prevalence of approximately 219 per 100,000 in females in Trinidad. Health services in Trinidad are mainly public sector with some private hospitals and clinics. Primary healthcare...

Ngày tải lên: 09/08/2014, 10:22

... issue, using broad-range PCR and/or reverse transcription PCR systems to search for bacterial DNA and RNA in synovial samples from patients with various forms of arthritis, including ReA [12,14,17]. ... Reactive arthritis. Best Pract Res Clin Rheumatol 2004, 18:689-703. 4. Hannu T, Inman R, Granfors K, Leirisalo-Repo M: Reactive arthri- tis or post-infectious arthritis? Best Pract Res Clin Rheumatol 2006, ... unclear. Introduction Bacteria are considered to be important in the pathogenesis of several forms of arthritis, including reactive arthritis (ReA) [1] or various other forms of post-infectious arthritis [2]. ReA is...

Ngày tải lên: 09/08/2014, 10:23

... marker transmission results in increased standard error for the regression coefficients. This study has provided further insight into properties of the test statistic for ... included in the analysis. Inclusion of offspring with incom- plete marker information in QTL mapping results in higher statistical power and lower standard errors and bias ... yield similar results when fitting more markers and searching for a QTL among marker brackets on the chromosome. When regression is performed on multiple markers, MRM amounts...

Ngày tải lên: 09/08/2014, 18:21

... occurring, were only ensured by link sires. By and large, a part of the males and females were randomly mated within-flock (within-flock mating), the other part being randomly mated with reproducers ... were simulated for offspring according to N(0, σ 2 E ) for direct effects and N(0, σ 2 C ) for maternal environmental effect. Residuals corresponding to records of dams were independent from residuals ... the corresponding (co)variances are presented in Table I. For the base population (which represents founder parents), random effects were sampled from normal distributions with zero mean and variances...

Ngày tải lên: 09/08/2014, 18:21

... were calculated using the following equation derived from (3) : The standard errors for these heritability estimates were obtained from the standard errors of the intraclass ... levels from F tests. Heritabilities and standard errors for the sib analysis were estimated according to the methods in FALCONER (1981). Intraclass correlations (t) were obtained ... University, Bundoora 3083, Victoria, Australia Summary Isofemale strains are having an increasing role in the analysis of variability of ecological and behavioural traits in natural populations....

Ngày tải lên: 09/08/2014, 22:22

Ngày tải lên: 11/08/2014, 08:21

Ngày tải lên: 11/08/2014, 16:23

Ngày tải lên: 11/08/2014, 17:21