Could significant regression be treated as insignificant: An anomaly in statistics?

2021 ◽  
pp. 1-19
Author(s):  
Yushan Cheng ◽  
Yongchang Hui ◽  
Shuangzhe Liu ◽  
Wing-Keung Wong
Keyword(s):  
Significant Regression

Regression analysis of indicators of a numerical experiment to determine the cooling time of oil

2020 ◽  
pp. 89-97
Author(s):  
A. U. Yakupov ◽  
D. A. Cherentsov ◽  
K. S. Voronin ◽  
Yu. D. Zemenkov
Keyword(s):  
Regression Analysis ◽  
Computer Experiment ◽  
Calculation Model ◽  
Cooling Time ◽  
Regression Coefficients ◽  
Fisher Criterion ◽  
Empirical Relationships ◽  
Factors Affecting ◽  
Oil Pipeline ◽  
Significant Regression

The article performed the processing of the results of a computer experiment to determine the cooling time of oil in a stopped oil pipeline. We proposed a calculation model in previous works that allows you to simulate the process of cooling oil.There was a need to verify the previously obtained results when conducting a laboratory experiment on a stand with soil. To conduct the experiment, it was necessary to conduct the planning of the experiment. The factors affecting the cooling time of oil in the oil pipeline, which will vary in the proposed experiment, are determined, empirical relationships are established. A regression analysis was carried out, and the dispersion homogeneity was checked using the Cochren criterion. The estimates of reproducibility variances are calculated. The adequacy hypothesis was tested using the Fisher criterion. Significant regression coefficients are established.

scholarly journals Regression of cephalic index following endoscopic repair of sagittal synostosis

2019 ◽  
Vol 23 (1) ◽  
pp. 54-60
Author(s):  
Nicholas A. Pickersgill ◽  
Gary B. Skolnick ◽  
Sybill D. Naidoo ◽  
Matthew D. Smyth ◽  
Kamlesh B. Patel
Keyword(s):  
Time Course ◽  
Strong Positive Correlation ◽  
Cephalic Index ◽  
Sagittal Synostosis ◽  
Endoscopic Repair ◽  
Future Studies ◽  
Helmet Therapy ◽  
Significant Regression ◽  
Strip Craniectomy

OBJECTIVEMetrics used to quantify preoperative severity and postoperative outcomes for patients with sagittal synostosis include cephalic index (CI), the well-known standard, and the recently described adjusted cephalic index (aCI), which accounts for altered euryon location. This study tracks the time course of these measures following endoscopic repair with orthotic helmet therapy. The authors hypothesize that CI and aCI show significant regression following endoscope-assisted repair.METHODSCT scans or 3D photographs of patients with nonsyndromic sagittal synostosis treated before 6 months of age by endoscope-assisted strip craniectomy and postoperative helmet therapy (n = 41) were reviewed retrospectively at three time points (preoperatively, 0–2 months after helmeting, and > 24 months postoperatively). The CI and aCI were measured at each time point.RESULTSMean CI and aCI increased from 71.8 to 78.2 and 62.7 to 72.4, respectively, during helmet treatment (p < 0.001). At final follow-up, mean CI and aCI had regressed significantly from 78.2 to 76.5 and 72.4 to 69.7, respectively (p < 0.001). The CI regressed in 33 of 41 cases (80%) and aCI in 39 of 41 cases (95%). The authors observed a mean loss of 31% of improvement in aCI achieved through treatment. A strong, positive correlation existed between CI and aCI (R = 0.88).CONCLUSIONSRegression following endoscope-assisted strip craniectomy with postoperative helmet therapy commonly occurs in patients with sagittal synostosis. Future studies are required to determine whether duration of helmet therapy or modifications in helmet design affect regression.

scholarly journals Concurrence of Meningomyelocele and Salt-Wasting Congenital Adrenal Hyperplasia due to 21-Hydroxylase Deficiency

2015 ◽  
Vol 2015 ◽  
pp. 1-4
Author(s):  
Heves Kırmızıbekmez ◽  
Rahime Gül Yesiltepe Mutlu ◽  
Serdar Moralıoğlu ◽  
Ahmet Tellioğlu ◽  
Ayşenur Cerrah Celayir
Keyword(s):  
Congenital Adrenal Hyperplasia ◽  
Growth Retardation ◽  
Adrenal Hyperplasia ◽  
Hydroxylase Deficiency ◽  
Salt Wasting ◽  
Significant Regression ◽  
One Year ◽  
The One ◽  
21 Hydroxylase Deficiency

Congenital adrenal hyperplasia (CAH) is a group of inherited defects of cortisol biosynthesis. A case of classical CAH due to 21-hydroxylase deficiency (21-OHD) with early onset of salt waste and concurrence of meningomyelocele (MMC) was presented here. The management of salt-wasting crisis which is complicated by a postrenal dysfunction due to neurogenic bladder was described. Possible reasons of growth retardation in the one-year follow-up period were discussed. A significant regression of the phallus with proper medical treatment was also mentioned.

Effect of environment factors on milk production and lactation length under different seasons in crossbred cattle

2015 ◽  
Author(s):  
S.S. Mote ◽  
D.S. Chauhan* and Nilotpal Ghosh1
Keyword(s):  
Milk Yield ◽  
Minimum Temperature ◽  
Summer Season ◽  
Climatic Variables ◽  
Coefficient Of Determination ◽  
Maximum Temperature ◽  
Temperature Minimum ◽  
Crossbred Cattle ◽  
Lactation Length ◽  
Significant Regression

The study was undertaken to evaluate the effect of different macro climatic variables on lactation milk yield and lactation length of Holdeo (Holstein Friesian x Deoni) crossbred cattle. Milk data of 145 Holdeo crossbred cows with 619 lactation records and the meteorological data over a period of 15 years (1995-2009) were obtained from Cattle Cross Breeding Project, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani and University Meteorological Observatory, respectively. It was observed that maximum temperature has significant correlation with lactation milk yield; whereas maximum temperature, minimum temperature, sunshine hours and wind speed have significant correlation with lactation length. Regression analysis indicated that all the climatic variables except minimum temperature exhibited significant regression results with lactation milk yield, and maximum temperature, minimum temperature and maximum humidity have significant regression results with lactation length. All the climatic variables considered in the study accounted for 75 % and 65 % direct variation on lactation milk yield and lactation length, respectively, as verified by the value of coefficient of determination (R2). It was observed that lactation milk yield (1136.56 + 21.04 kg.) and lactation length (295.29 + 5.51 days) were highest among the cows calved during winter season as compared to rainy and summer season. All the climatic variables considered in the study accounted for 57% , 56 % and 48 % direct variation on milk yield and 68% , 53 % and 46 % direct variation on lactation length in rainy, winter and summer season, respectively, as verified by the value of coefficient of determination (R2). This research indicated that crossbred cows were sensitive to seasonal changes on their lactation performance. The optimum ranges of temperature; humidity and THI for better performance of crossbred in subtropical region of India were found to be 19-26 oC, 52-66 % and 65-68 %, respectively.

scholarly journals Effects of climatic factors and air pollution on damage of London plane (Platanus hispanica Mill.)

2010 ◽  
Vol 37 (No. 3) ◽  
pp. 109-117 ◽  
Author(s):  
B. Gregorová ◽  
K. Černý ◽  
V. Holub ◽  
V. Strnadová
Keyword(s):  
Air Pollution ◽  
Regression Analysis ◽  
Health Status ◽  
Climatic Factors ◽  
Total Precipitation ◽  
The Czech Republic ◽  
Air Temperatures ◽  
Significant Regression ◽  
London Plane

London plane (Platanus hispanica Mill.) is considered as very tolerant to pollution and other stresses and in the Czech Republic it has been unaffected by important pathogens until now. However, in recent years the health status of London plane has been significantly deteriorating. During an 11-year survey it was found out that development of London plane damage was characterized by important fluctuations. Minimum value of population damage was 3.6% and maximum 97.5%. The health status of London plane was negatively influenced by long-term precipitation totals, higher total precipitation in May, low average air temperatures in January and May and higher NO<sub>x</sub> concentrations in the vegetation season. Using the multiple regression analysis a highly significant regression model was obtained, wherein the average air temperatures in January and May explain together 84% variability of London plane population damage. During the period of the highest damage, planes were moreover affected by the pathogen Apiognomonia veneta (Sacc. et Spegg.) H&ouml;hn. &nbsp;

scholarly journals Coexistence of Ankylosing Spondylitis and Löfgren’s Syndrome

2014 ◽  
Vol 2014 ◽  
pp. 1-3 ◽  
Author(s):  
Senol Kobak ◽  
Fidan Sever ◽  
Oya Sivrikoz ◽  
Ahmet Karaarslan
Keyword(s):  
Ankylosing Spondylitis ◽  
Low Dose ◽  
Histopathological Examination ◽  
Skin Lesions ◽  
Lymph Node Biopsy ◽  
Node Biopsy ◽  
Löfgren’S Syndrome ◽  
Significant Regression ◽  
Dose Corticosteroid ◽  
Thorax Ct

A 46-year-old male patient diagnosed with ankylosing spondylitis presented to our polyclinic with complaints of pain, swelling, and limitation in joint mobility in both ankles and erythema nodosum skin lesions in both pretibial sites. The sacroiliac joint graphy and the MRI taken revealed active and chronic sacroiliitis. On the thorax CT, multiple mediastinal and hilar lymphadenopathies were reported. Mediastinoscopic excisional lymph node biopsy was taken and noncalcified granulomatous structures, lymphocytes, and histiocytes were determined on histopathological examination. The patients were diagnosed with ankylosing spondylitis, sarcoidosis, and Löfgren’s syndrome. NSAIDs, sulfasalazine, and low dose corticosteroid were started. Significant regression was seen in the patient’s subjective and laboratory assessments.

Physical insulation of Korean diving women

1962 ◽  
Vol 17 (6) ◽  
pp. 961-966 ◽  
Author(s):  
D. W. Rennie ◽  
B. G. Covino ◽  
B. J. Howell ◽  
S. H. Song ◽  
B. S. Kang ◽  
...  
Keyword(s):  
Cold Adaptation ◽  
Water Immersion ◽  
Subcutaneous Fat ◽  
Constant Temperature Bath ◽  
Men And Women ◽  
Skin Fold Thickness ◽  
Skin Fold ◽  
Fat Thickness ◽  
Significant Regression ◽  
Cutaneous Vasoconstriction

Human cold adaptation was studied by comparing maximal body insulation [ I = (rectal temp. – skin temp.) /rate of skin heat loss] of Korean diving women to insulation of Korean nondiving men and women and American men and women. Appropriate measurements were made during immersion in a constant-temperature bath cool enough to induce maximal cutaneous vasoconstriction without shivering. Subcutaneous fat was estimated from measurements of skin-fold thickness. Within each racial group there is a significant regression of I on fat thickness. Koreans had a significantly greater I than Americans of comparable fat thickness. Korean diving women had the same I as nondivers of comparable fat thickness. Korean women had significantly greater I than Korean men due, we believe, to thicker subcutaneous fat. This may be the reason why women and not men engage in diving. The only evidence for cold adaptation among diving women was their ability to withstand colder water immersion without shivering. Submitted on March 22, 1962

scholarly journals Clinical efficiency of treatment of cough in pediatric practice

2019 ◽  
pp. 194-198 ◽  
Author(s):  
G. Yu. Evstifeeva ◽  
O. Yu. Trusova ◽  
E. I. Danilova ◽  
V. V. Sumenko
Keyword(s):  
Respiratory Tract Infections ◽  
Comparison Group ◽  
Upper Respiratory Tract ◽  
Pediatric Practice ◽  
Upper Respiratory ◽  
Group 2 ◽  
Significant Regression ◽  
Tract Infections ◽  
Efficacy Of Treatment ◽  
Group 1

Cough is one of the most common reasons why parents bring their children to the pediatrician. The article presents the results of a study of the clinical efficacy of treatment of dry cough using Sinecod syrup. A total of 60 children aged 3–15 years with the upper respiratory tract infections and complaints of dry (non-productive) cough were enrolled in the study. In Group 1 (the main group), the children received Sinecod syrup in addition to the standard therapy, in Group 2 (the comparison group) children received Stoptussin-Phyto syrup. The effectiveness of treatment was evaluated based on the clinical examination findings. On Day 8–11 after the first examination, Group 2 showed a decrease in the severity of day and night cough according to VAS by more than 4 points compared with Group 2. Significant regression of the severity of day and night cough in the studied groups was only observed in patients from Group 1. Sleep disorders of the patients normalized.

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