Controlling for test variables
Posted by Armando Brito Mendes | Filed under estatística, lições, materiais ensino, software
clique no ícon para seguir o link
alguns apontamentos sobre testes com vars de controlo
3.2 Three (or more) variables
Introducing a third variable. Controlling for test variables. Elaboration.
Logical model is X → Y . T (the effect of X on Y controlling for T) where:
Y = Dependent variable
X = Independent variable
T = Test variable(s)
3.2.1 Elaboration
Tags: inferência, software estatístico
What is SPSS?
Posted by Armando Brito Mendes | Filed under estatística, materiais ensino, software
clique no ícon para seguir o link
Uma explicação para as ciências sociais
What is SPSS and what does it do?
SPSS consists of an integrated series of computer programs which enable the user to read data from questionnaire surveys and other sources (e.g. medical and administrative records) to manipulate them in various ways and to produce a wide range of statistical analyses and reports, together with documentation.
Most users will have access to SPSS via their college or workplace or by purchasing the Gradpack version (specially priced for students). Full details are on IBM SPSS Solutions for Education and there is a comparison table showing what is available in each version.
Tags: IBM SPSS Statistics, software estatístico
Summary guide to SPSS tutorials
Posted by Armando Brito Mendes | Filed under data sets, estatística, materiais ensino, software
clique no ícon para seguir o link
Bom site com vários recursos sobre a utilização do IBM SPSS
Catalogue of SPSS tutorials is an Excel *.xlms file containing a full listing (with hyperlinks) of all tutorial files.[may not be completely up-to-date]
Guide to pop-out menus shows all the screenshots for menus and sub-menus for Survey Analysis Workshop [may not be completely up-to-date and site has been re-organised, so needs a re-write, but still useful to show you what to expect]
There are more than 600 pages of downloadable tutorials arranged in four blocks.
Block 1: From questionnaire to SPSS saved file
1.1: The language of survey analysis
1.2: How do data relate to questionnaires?
1.3: Reading raw data into SPSS
1.4: Completing your data dictionary
1.5: Utilities [still in preparation]
Block 2: Analysing one variable
2.1: Nominal and ordinal variables
2.2: Interval scale variables
2.3: Data transformations
Block 3: Analysing two variables (and sometimes three)
3.1 Contingency tables
3.2 Three variables
3.3 Multiple response
3.4 Comparing means
3.5: Conditional transformations
Block 4: Hypothesis testing
[Still in preparation: provisional contents listed below: page also has links to some useful resources for statistical concepts]
Hypothesis testing
4.2a t-test and one way anova
4.2b Testing differences between three or more means
4.3 Chi-square (has one tutorial)
4.4 Regression and correlation
4.5 Association, structure and cause
SPSS files and documentation used for tutorials and exercises
Tags: análise de dados, IBM SPSS Statistics, inquéritos, software estatístico
SPSS videos e trials
Posted by Armando Brito Mendes | Filed under estatística, software
clicar na imagem para seguir o link
Um site da IBM com bastantes recursos sobre o SPSS
Software Trial: IBM SPSS Statistics Desktop
Start leveraging your data today to identify your best customers, forecast future trends, improve supplier performance, and more.
![Software Trial: IBM SPSS Text Analytics for Surveys Trial Software [US]](http://www.ibm.com/software/analytics/spss/products/statistics/images/icon-text-analysis-60x60.jpg){kind=icon}
Software Trial: IBM SPSS Text Analytics for Surveys Trial Software [US]
IBM SPSS Text Analytics for Surveys uses powerful natural language processing technologies specifically designed for survey text.
Software Trial: IBM SPSS Amos Trial
IBM SPSS Amos gives you the power to easily perform structural equation modeling (SEM).
Online Demo: IBM SPSS Regression in action
Watch how powerful regression techniques can help you discover hidden relationships in your data.
![Online Demo: Two-step cluster analysis: Find natural groups in your data [US]](http://www.ibm.com/software/analytics/images/offers/video-thumb/od_spssrc_ibm_spss_statistics_base_127x96.jpg)
Online Demo: Two-step cluster analysis: Find natural groups in your data [US]
Watch a short demonstration of the two-step cluster analysis technique in SPSS Statistics Base.
![Online Demo: Online Demo: Statistical analysis with confidence using IBM SPSS Statistics [US]](http://www.ibm.com/software/analytics/images/offers/video-thumb/od_spssrc_ibm_spss_statistics_product_overview_127x96.jpg)
Online Demo: Online Demo: Statistical analysis with confidence using IBM SPSS Statistics [US]
Explore the power of statistical analysis in your organization IBM Analytics IBM Analytics
![White Paper: White Paper: Better decision making under uncertain conditions [US]](http://www.ibm.com/software/analytics/images/thumbs/offers/wp_spssrc_simulation_modeling_in_ibm_spss_statistics_98x120.jpg)
White Paper: White Paper: Better decision making under uncertain conditions [US]
This paper describes Monte Carlo simulation, the value of this technique for risk analysis and how SPSS Statistics and its Monte Carlo simulation capabilities can help businesses assess for risk.
![White Paper: The Risk of Using Spreadsheets for Statistical Analysis [US]](http://www.ibm.com/software/analytics/elq/images/thumbs/IMW14297USEN.jpg)
White Paper: The Risk of Using Spreadsheets for Statistical Analysis [US]
Despite their popularity, spreadsheets may not be well suited for analysis and decision making. This paper explores why, and describes a better alternative.
Tags: análise de dados, IBM SPSS Statistics, software estatístico
Raynald’s SPSS Tools
Posted by Armando Brito Mendes | Filed under estatística, materiais para profissionais, software
Bons recursos sobre SPSS e ligação com R e Pyton
Raynald’s SPSS Tools
The collection of syntaxes, macros, scripts and hints for better solutions of data management and data analysis problems in IBM SPSS Statistics
Tags: análise de dados, decisão médica, Estat Descritiva, IBM SPSS Statistics, R-software, software estatístico
Random Probability, Mathematical Statistics, Stochastic Processes
Posted by Armando Brito Mendes | Filed under estatística, lições, software
clique na imagem para seguir o link
Um site organizado por temas como um livro com apps interessantes
Welcome!
Random (formerly Virtual Laboratories in Probability and Statistics) is a website devoted to probability, mathematical statistics, and stochastic processes, and is intended for teachers and students of these subjects. The site consists of an integrated set of components that includes expository text, interactive web apps, data sets, biographical sketches, and an object library. Please read the Introduction for more information about the content, structure, mathematical prerequisites, technologies, and organization of the project. Random is hosted at two sites: www.math.uah.edu/stat/ and www.randomservices.org/stat/. For updates, please follow @randomservices on Twitter.
Basic Information
Expository Chapters
- Foundations
- Probability Spaces
- Distributions
- Expected Value
- Special Distributions
- Random Samples
- Point Estimation
- Set Estimation
- Hypothesis Testing
- Geometric Models
- Bernoulli Trials
- Finite Sampling Models
- Games of Chance
- The Poisson Process
- Renewal Processes
- Stochastic Processes
- Markov Chains
- Brownian Motion
Ancillary Materials
Support and Navigation
Tags: software estatístico
Rice Virtual Lab in Statistics Demos
Posted by Armando Brito Mendes | Filed under estatística, materiais ensino, software
clique na imagem para seguir o link
Pequenas apps em java para demonstrar diferentes temas em estatística
Sampling Distribution Simulation
Normal Approximation to the Binomial Distribution
Confidence Interval on a Proportion
A “Small” Effect Size Can Make a Large Difference
Chi Square Test of Deviations from Expected Frequencies
Reliability and Regression Analysis
Histograms, Bin Widths, and Cross Validation
Unequal n ANOVA and Types of Sums of Squares
Robustness of t test and ANOVA
Tags: software estatístico
KNIME Community Contributions
Posted by Armando Brito Mendes | Filed under materiais para profissionais, software
clicar na imagem para seguir o link
Boa fonte de novos nós do KNIME, evitando q estejamos a programar algo q já foi programado antes.
KNIME Community Contributions offer a wide range of KNIME nodes from different application areas, such as chemo- and bioinformatics, image processing, or information retrieval. In contrast to the extensions available via the standard KNIME Update Site they are provided and maintained by various community developers.
The Trusted Community Contributions can easily be installed by selecting File -> Install KNIME Extensions in KNIME. Additional extensions are available by enabling the Update Site in KNIME via File -> Preferences -> Install/Update -> Available Update Sites. See the update site guide for details.
You can also download the whole update site as a ZIP archive and add the ZIP to the Available Update Sites (see above).
Tags: data mining, Knime, software estatístico, text mining
The Statistics Portal
Posted by Armando Brito Mendes | Filed under estatística, materiais para profissionais, visualização
clicar na imagem para seguir o link
We pride ourselves in being one of the world’s first and only companies to bring together data from over 18,000 sources.
Our research analysts source the most up-to-date statistical data from around the globe; our analytical approach and efficient research processes enable us to supply our clients with the data that is relevant to them.
Tags: análise de dados, Estat Descritiva, software estatístico
Comprehensive Guide to Data Visualization in R
Posted by Armando Brito Mendes | Filed under estatística, visualização
clique na imagem para seguir o link
Bom resumo de alguns tipos de gráficos que podem ser obtidos no R, do mais simples a alguns mais complexos.
This visualization (originally created using Tableau) is a great example of how data visualization can help decision makers. Imagine telling this information to an investor through a table. How long do you think you will take to explain it to him?
With ever increasing volume of data in today’s world, it is impossible to tell stories without these visualizations. While there are dedicated tools like Tableau, QlikView and d3.js, nothing can replace a modeling / statistics tools with good visualization capability. It helps tremendously in doing any exploratory data analysis as well as feature engineering. This is where R offers incredible help.
R Programming offers a satisfactory set of inbuilt function and libraries (such as ggplot2, leaflet, lattice) to build visualizations and present data. In this article, I have covered the steps to create the common as well as advanced visualizations in R Programming.
Tags: análise de dados, data mining, Estat Descritiva, R-software, software estatístico
