Continuous variables are presented as mean ± standard deviation, or as median and range if the distribution was not normal. Normality was assessed using the Kolmogorov-Smirnov test. Categorical variables are presented as percentages. Between group analyses of categorical variables were performed using the t test for normally distributed data and Mann-Whitney test for non-normally distributed data. χ2 test was used for comparison of categorical data. Correlation was estimated by either the Spearman or Pearson coefficient. All tests were two-tailed and P < 0.05 was considered statistically signficant. All analyses were performed using Statistica software package v 12 (StatSoft, Inc., Tulsa, OK, USA, 2014).
Statistica software package v 12
Manufactured by StatSoft
Sourced in United States
Statistica software package v 12 is a comprehensive data analysis and visualization tool designed for scientific and research applications. It provides a wide range of statistical analysis methods, including regression, multivariate analysis, time series analysis, and more. The software package is capable of handling large datasets and offers advanced features for data management, modeling, and reporting.
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Lab products found in correlation
2 protocols using statistica software package v 12
1
Statistical Analysis of Continuous and Categorical Data
2
Survival Analysis of Tumor Subgroups
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Statistical analysis was performed using the Statistica software package, v. 12 (StatSoft Inc., Tulsa, OK, USA). Outcome measures included disease-free survival (DFS) and overall survival (OS). DFS and OS were calculated from the date of surgery until the date of recurrence or last follow-up visit (DFS) or until death or last follow-up visit (OS). Kaplan-Meier methods were used to estimate survival outcomes. The log-rank test was used to compare survival curves.
The chi-square test was used to determine if clinical variables including age, advanced T stage, high grade of tumour, PNI, LVI, location of the tumour, and histopathologic subtype differed between neck management groups: elective neck dissection, elective neck irradiation, and observation. A value of p < 0.05 was considered statistically significant.
The chi-square test was used to determine if clinical variables including age, advanced T stage, high grade of tumour, PNI, LVI, location of the tumour, and histopathologic subtype differed between neck management groups: elective neck dissection, elective neck irradiation, and observation. A value of p < 0.05 was considered statistically significant.
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