In this work, we show that Spearman’s correlation coefficient test about H0:ρs=0 found in most statistical software is theoretically incorrect and performs poorly when bivariate normality assumptions are not met or the sample size small. There common misconception tests ρs=0 robust to deviations from normality. However, under certain scenarios violation of assumption has severe effects on type ...

In the typology of coefficients correlation, we seem to miss such estimators correlation as rank–polyserial ( R RPS ) and rank–polychoric RPC correlation. This article discusses a set options RP , including both . A new coefficient JT gX based on Jonckheere–Terpstra test statistic is derived, it shown carry essence Such traditional Goodman–Kruskal gamma G Somers delta D dimension-corrected 2 ar...

In this study, the concept of relative membership degree is proposed to investigate grey optimal cluster evaluation. Besides, the correlation coefficient between sample observation value and standard eigenvalue is used to reflect the similarity degree of evaluation objective and each cluster centre. Based on those mentioned above and concept of relative membership degree, an optimized grey clus...

• In the most difficult case where the number of observations n ≡ 3 (mod 4), high Defficiency of certain chemical balance weighing designs under completely symmetric covariance matrix of errors is shown. It is also proved that D-optimal design may depend on the values of the correlation coefficient.

The conventional starch determination (employing precipitation, filtration, re-dissolution, colour development) is compared with a simplified direct colorimetric procedure, which is readily automated. The reproducibility is better than 3%, with a correlation coefficient of 0,87 between the two methods.

This paper describes the specifications and results of UMCC_DLSI system, which participated in the Semantic Textual Similarity task (STS) of SemEval-2013. Our supervised system uses different types of lexical and semantic features to train a Bagging classifier used to decide the correct option. Related to the different features we can highlight the resource ISR-WN used to extract semantic relat...

We calculated the correlation between the state-level quality measures and prices to address the question “is higher quality associated with higher prices?” The correlation coefficients are presented in Table 1. A positive correlation implies higher quality measures occur where prices are higher. A negative correlation implies the quality measures are relatively lower where prices are higher an...