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Sample-size analysis for confidence intervals in Stata 16
The new ciwidth command performs Precision and Sample Size (PrSS) analysis, which is sample-size analysis for confidence intervals (CIs). This method is used when you are planning a study and you want to optimally allocate resources when CIs are to be used for inference. Said differently, you use this method when you want to estimate the sample size required to achieve the desired precision of a CI in a planned study.
ciwidth produces sample sizes, precision, and more that are required for the
• CI for one mean
• CI for one variance
• CI for two independent means
• CI for two paired means
The control panel interface lets you select the analysis type and input assumptions to obtain desired results.
ciwidth allows results to be displayed in customizable tables and graphs.
ciwidth also provides facilities for you to add your own methods.

In Stata 16, you can embed and execute Python code from within Stata. Stata's new python command allows you to easily call Python from Stata and output Python results within Stata.
You can invoke Python interactively or in do-files and ado-files so that you can leverage Python's extensive language features. You can also execute a Python file (.py) directly through Stata.
In addition, we introduced the Stata Function Interface (sfi) Python module, which provides a bi-directional connection between Stata and Python. This module lets you access Stata's current dataset, frames, macros, scalars, matrices, value labels, characteristics, global Mata matrices, and more.
All of this means that you can now use any Python package directly within Stata. For instance, you can use Matplotlib to draw 3-dimensional graphs. You can use NumPy for numerical computations. You can use Scrapy to scrape data from the web. You can access additional machine-learning techniques such as neural networks and support vector machines through TensorFlow and scikit-learn. And much more.
Finally, Stata’s Do-file Editor now includes syntax highlighting for the Python language.
While advanced users and programmers might be most likely to take advantage of Python integration, the availability of Python within Stata will excite many more users in all disciplines.

Stata 是一套提供其使用者数据分析、数据管理以及绘制图表的完整及整合性统计软件。它提供许许多多功能,包含线性混合模型、均衡重复反复及多项式普罗比模式。用Stata绘制的统计图形相当精美。

As a quick introduction to Bayesian analysis, we use an example, described in Hoff (2009, 3),
of estimating the prevalence of a rare infectious disease in a small city. A small random sample of
20 subjects from the city will be checked for infection. The parameter of interest 2 [0; 1] is the
fraction of infected individuals in the city. Outcome y records the number of infected individuals in
the sample. A reasonable sampling model for y is a binomial model: yj Binomial(20; ). Based
on the studies from other comparable cities, the infection rate ranged between 0.05 and 0.20, with
an average prevalence of 0.10. To use this information, we must conduct Bayesian analysis. This
information can be incorporated into a Bayesian model with a prior distribution for , which assigns
a large probability between 0.05 and 0.20, with the expected value of close to 0.10. One potential
prior that satisfies this condition is a Beta(2; 20) prior with the expected value of 2=(2+20) = 0.09.
So, let’s assume this prior for the infection rate , that is, Beta(2; 20). We sample individuals
and observe none who have an infection, that is, y = 0. This value is not that uncommon for a small
sample and a rare disease. For example, for a true rate = 0.05, the probability of observing 0
infections in a sample of 20 individuals is about 36% according to the binomial distribution. So, our
Bayesian model can be defined as follows:
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