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Basic Statistics in sage
No need to spend big bucks in the purchase of expensive statistical software packages (SPSS or SAS): the R programming language will do it all for you, and of course sage has a neat way to interact with it. Let me prove you its capabilities with an example taken from one of the many textbooks used to teach the practice of basic statistics to researchers of Social Sciences (sorry, no names, unless you want to pay for the publicity!)
Estimating Mean Weight Change for Anorexic Girls
The example comes from an experimental study that compared various treatments for young girls suffering from anorexia, an eating disorder. For each girl, weight was measured before and after a fixed period of treatment. The variable of interest was the change in weight; that is, weight at the end of the study minus weight at the beginning of the study. The change in weight was positive if the girl gained weight, and negative if she lost weight. The treatments were designed to aid weight gain. The weight changes for the 29 girls undergoing the cognitive behavioral treatment were
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Math updates on arXiv.org
- Toeplitz algebra and Symbol map via Berezin transform on $H^2(\mathbb{D}^n)$
- Some notes on an identity of Frisch
- Mahonian Statistics and Vincular Patterns on Permutations over Multisets
- Reflections and maximal quotients in Coxeter groups
- Linear canonical space-time transform and convolution theorems
- Optimization with Temporal and Logical Specifications via Generalized Mean-based Smooth Robustness Measures
- Generalized Fractional Risk Process
- Homological Lemmas in a Non-pointed Context
- Two Combinatorial Interpretations of Rascal Numbers
- A convergence result for Mean Curvature Flow of totally real submanifolds
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Francisco Blanco-Silva 