On correlation coefficients and their interpretation

Papageorgiou, Spyridon N.

doi:10.1177/14653125221076142

Cited by 18 publications

(15 citation statements)

References 5 publications

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“…Convergent validity between CC distance and V angle was reported as the Pearson correlation coefficient, with a result of < 0.2 interpreted as very weak; 0.2–0.39 as weak, 0.4–0.59 as moderate, 0.6–0.79 as strong and > 0.8 as strong [19].…”

Section: Methodsmentioning

confidence: 99%

The V angle compliments radiographic assessment of acute acromioclavicular joint dislocations by differentiating between Rockwood types III versus V and by considering dynamic horizontal translation in coronal radiographs

Vetter,

Eckl,

Bellmann

et al. 2023

Knee surg. sports traumatol. arthrosc.

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Purpose Acromioclavicular joint (ACJ) dislocations are usually graded radiographically according to Rockwood, but differentiation between Rockwood types III and V may be ambiguous. The potentially clinically relevant horizontal instability is barely addressed in coronal radiographs. It was hypothesized that a new radiologic parameter (V angle) would complement ACJ diagnostics on anteroposterior radiographs by differentiating between cases of Rockwood III and V while also considering the aspect of dynamic horizontal translation (DHT). Methods Ninety-five patients with acute ACJ dislocations (Rockwood types III and V) were included retrospectively between 2017 and 2020. On anteroposterior views (weightbearing: n = 62, non-weight-bearing: n = 33), the coracoclavicular (CC) distance and the newly introduced V angle for assessing scapular orientation were measured bilaterally. This angle is referenced between the spinal column and a line crossing the superior scapular angle and the crossing point between the supraspinatus fossa and the medial base of the coracoid process, reported as the side-comparative difference (non-injured side *minus* injured side). DHT on Alexander views was divided into stable, partially unstable or completely unstable. ResultsThe V angle on the injured side alone (mean 50.0°; 95% confidence interval (CI), 48.6°-51.3°) showed no correlation with the side-comparative CC distance [%] (r = − 0.040; n.s.). Thus, the V angle on the non-injured side was considered, displaying a normal distribution (n.s.) with a mean of 58.0° (95% CI, 56.6°-59.4°). The side-comparative V angle showed a correlation with the side-comparative CC distance (r = 0.83; p < 0.001) and was able to differentiate between Rockwood types III (4.7°; 95% CI, 3.9°-5.5°; n = 39) and V (10.3°; 95% CI, 9.7°-11.0°; n = 56) (p < 0.001). A cut-off value of 7° had a 94.6% sensitivity and an 82.1% specificity (area under curve, AUC: 0.954; 95% CI, 0.915-0.994). The side-comparative V angle was greater for cases with complete DHT (8.7°; 95% CI, 7.9°-9.5°; n = 78) than for cases with partial DHT (4.8°; 95% CI, 3.3°-6.3°; n = 16) (p < 0.001). A cut-off value of 5° showed a sensitivity of 84.6% and a specificity of 66.7% (AUC 0.824; 95% CI, 0.725-0.924). ConclusionThe scapular-based V angle on anteroposterior radiographs distinguishes between Rockwood types III and V as well as cases with partial or complete DHT. Study design Diagnostic study. Level of evidence Level II.

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Section: Methodsmentioning

confidence: 99%

The V angle compliments radiographic assessment of acute acromioclavicular joint dislocations by differentiating between Rockwood types III versus V and by considering dynamic horizontal translation in coronal radiographs

Vetter,

Eckl,

Bellmann

et al. 2023

Knee surg. sports traumatol. arthrosc.

View full text Add to dashboard Cite

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“…If the actual value of the F-Criterion is less than the table value, then there is no reason to reject the null hypothesis [18]. And if not, then the null hypothesis is rejected and the alternative hypothesis about the statistical significance of the equation as a whole is accepted with probability (1-α).…”

Section: Source: Created By the Authormentioning

confidence: 98%

“…Note that a correlation coefficient with a positive value means a direct relationship, and with a negative value, an inverse relationship [18]. A high degree of dependence is considered to be the value of the correlation coefficient (modulo) greater than 0.80.…”

Section: Periodmentioning

confidence: 99%

Correlation-regression Analysis of the Relationship between the Volume of Sales of Goods and the use of Rotary Photo Tables for Their Presentation in Online Stores

Petrov¹

2022

JEMT

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Aims: The aim of this article was to determine the existence of a relationship between the volume of sales of goods by an online store and the use of rotary photo tables for the presentation of goods, using mathematical methods and models. Study Design: In order to determine the relationship between the volume of sales of goods at the online store and the use of rotary photo tables for the presentation of goods, economic and mathematical modeling was carried out on the base of the data of online store "Ukrasa". Place and Duration of Research: Russian Federation. Methodology: To achieve the goals, the research used such methods as analysis and synthesis, induction and deduction, comparison and grouping, methods of mathematical modeling (correlation-regression analysis). Results: On the basis of mathematical methods, it was established that there is a relationship between the volume of sales of goods by the online store and the number of goods that are presented with the help of photos and videos made with the use of turntables for photography. As a result of the research, it was established that 78,85% of the total change in the volume of sales of goods is explained by the change in the presentation of goods on the site with the help of rotary photo tables. Conclusion: The conducted research showed the importance of using rotary photo tables for presenting goods in online store. The economic interpretation of the parameters of the model shows that the increase in the number of goods presented with the help of photos and videos made with the use of rotary tables for photography will increase by one hundred units, then the volume of sales of goods will increase by 1661,9 thousand hryvnias.

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“…The closer the value of R2 to 1, the better the statistical data correspond to the constructed regression function [17]. The value should be several times higher than the tabular value, then the regression will not only be significant, but also have practical value for forecasting.…”

Section: The Set Of Information Input Data Must Be Checked For the Pr...mentioning

confidence: 99%

“…The value of the correlation coefficient is always in the range from -1 to +1, the closer the value is to 0, the lower the level of dependence, and accordingly, the closer the value is to 1, the higher the level of dependence of the indicators between other [17]. Need to note that a correlation coefficient with a positive value means a direct dependence, and with a negative value means an inverse dependence [20].…”

Section: Table 1 Data For Conducting a Correlation-regression Analysi...mentioning

confidence: 99%

The Influence of the Use of Rotary Photo Tables for the Presentation of Goods on the Volume of their Sale in Online Stores

Petrov¹

2022

JEMT

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Aims: The purpose of this article was to confirm the dependence between the volume of sales of goods by online stores and the use of rotary photo tables for the presentation of goods, using mathematical methods and models. The use of correlation-regression analysis to assess economic processes and trends, as well as the development of a model of dependence between the volume of sales of goods by an online store and the use of rotary photo tables for the presentation of goods. Study Design: In order to determine the relationship between the volume of sales of goods in the online store and the use of rotary photo tables for the presentation of goods, an economic and mathematical modeling was carried out in the work based on the database of online stores «Yin.gold», «Nihaoejwelry Wholesale Store», «W.P. Jewellery». Methodology: The following methods were used in this research: analysis, synthesis, induction, deduction, comparison, grouping, methods of mathematical modeling and mathematical statistics. The use of these methods is aimed at achieving the tasks set in the research. The information base of the research consists of the works of recognized specialists, as well as data from the online stores «Yin.gold», «Nihaoejwelry Wholesale Store», «W.P. Jewellery». Results: On the basis of mathematical methods (correlation-regression analysis), it was confirmed an actual dependence between the volume of sales of goods by online stores and the number of goods that are presented with the help of photos and videos made with the use of rotary tables for photography. The economic effect of using rotary photo tables for object photography for the investigated online stores is quantified. Conclusion: The conducted research confirmed the high importance of using rotary photo tables for the presentation of goods in the online store. The economic interpretation of the parameters of each of the built models shows that the increase in the number of products presented on the website of the online store with the use of rotary tables for photography leads to an increase in the volume of sales.

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On correlation coefficients and their interpretation

Cited by 18 publications

References 5 publications

The V angle compliments radiographic assessment of acute acromioclavicular joint dislocations by differentiating between Rockwood types III versus V and by considering dynamic horizontal translation in coronal radiographs

The V angle compliments radiographic assessment of acute acromioclavicular joint dislocations by differentiating between Rockwood types III versus V and by considering dynamic horizontal translation in coronal radiographs

Correlation-regression Analysis of the Relationship between the Volume of Sales of Goods and the use of Rotary Photo Tables for Their Presentation in Online Stores

The Influence of the Use of Rotary Photo Tables for the Presentation of Goods on the Volume of their Sale in Online Stores

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