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Useful command for stata



Maximum Likelihood (write your own commands)

Moving Averages & Data Cleaning

Data Imputation
Unobserved Effect Models

Instrumental Variables
 Many Forms of Instrumental Variables
 The Weak Instrument Problem
 Testing the Rank Condition of IV Estimators
 2SQreg IVqreg Cfqreg – zombies

Censored Regression
Dependent variable is bottom coded 
Asymmetric Error with Right and Left Sensoring
Tobit Normality Assumption Fail – Tobit Still Works
Cragg’s Double hurdle model used to explain censoring

Quantile Regression
Program your own quantile regression v1 – Maximum Likelihood 
Quantile Regression Fail
Oh wait! Quantile regression wins!
 2SQreg IVqreg Cfqreg – zombies
 Quantile Regression (qreg) is invariant to non-decreasing transformations

Random Coefficients
 Estimating Random Coefficients on X (using xtmixed)
Estimating Random Coefficients on X (using NormalReg -preferred)

Binary Response Models
My Own Tools (No Theory Backing Them)
Breaking down R2 by variable
Sticky Probit – clustered bootstrapped standard errors
 Non-Parametric PDF Fit Test
 Test of PDF Fit – Does not workPower Analysis
Power Analysis with Non-Linear Least Squares: A Simulation Approach

Miscellaneous Topics

Special Topics

Value-added modelling iPad example


Health Insurance



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Why Our Healthcare System Isn’t Healthy

Deb Bromley

Most people are well aware that an estimated 45 million Americans currently do not have healthcare, but is the crisis simply the lack of health insurance or even the cost of health insurance? Is there a bigger underlying problem at the root of our healthcare system? Although the U.S. claims to have the most advanced medicine in the world, government health statistics and peer-reviewed journals are painting a different picture — that allopathic medicine often causes more harm than good.

People in general have always felt they could trust doctors and the medical profession, but according to the Journal of the American Medical Association in July 2000, iatrogenic death, also known as death from physician error or death from medical treatment, was the third leading cause of death in America and rising, responsible for at least 250,000 deaths per year. Those statistics are considered conservative by many, as the reported numbers only include in-hospital deaths, not injury or disability, and do not include external iatrogenic deaths such as those resulting from nursing home and other private facility treatments, and adverse effects of prescriptions. One recent study estimated the total unnecessary deaths from iatrogenic causes at approximately 800,000 per year at a cost of $282 billion per year, which would make death from American medicine the leading cause of death in our country.

Currently, at least 2 out of 3 Americans use medications, 32 million Americans are taking three or more medications daily, and commercials and advertisements for pharmaceutical drugs have saturated the marketplace. Although our population is aging, exorbitantly expensive drugs are being marketed and dispensed to younger and younger patients, including many children who years ago would never have been given or needed medication, for everything from ADHD to asthma to bipolar disease and diabetes. Clearly, the state of health in this country is not improving even though there are an increasing number of medications and treatments. Between 2003 and 2010, the number of prescriptions are expected to increase substantially by 47%. In recent years, numerous drugs previously deemed safe by the FDA have been recalled because of their toxicity, after the original drug approvals were actually funded by the invested pharmaceutical companies themselves.

According to the media, thanks to advances in U.S. drugs and medical procedures, Americans are living longer statistically, but they are living longer sicker, with a lower quality of life, and often dependent on multiple expensive synthetic medications that do not cure or address the underlying causes, but only suppress symptoms, often with a plethora of dangerous side effects to the tune of billions of dollars for the drug industry. Considering that the U.S. is supposed to have the most advanced technology in the world and the best health care system, it is at odds that we spend the most on healthcare, yet are the most obese and most afflicted with illness outside of the AIDS epidemic in some third world countries.

Unless you have an acute emergency that requires emergency room care, being admitted to a hospital environment may also be more dangerous to your health than staying out. In 2003, epidemiologists reported in the New England Journal of Medicine that hospital-acquired infections have risen steadily in recent decades, with blood and tissue infections known as sepsis almost tripling from 1979 to 2000. Nearly two million patients in the U.S. get an infection while in the hospital each year, and of those patients over 90,000 die per year, up dramatically from just 13,300 in 1992. Statistics show that approximately 56% of the population has been unnecessarily treated, or mistreated, by the medical industry.

Additionally, as a result of the overuse of pharmaceutical drugs and antibiotics in our bodies and environment, our immune systems have become significantly weakened, allowing antibiotic-resistant strains of disease-causing bacteria to proliferate, leaving us more susceptible to further disease. Not surprisingly, incidences of diseases have been growing at epidemic levels according to the CDC. Now diseases once thought conquered, such as tuberculosis, gonorrhea, malaria, and childhood ear infections are much harder to successfully treat than they were decades ago. Drugs do not cure. They only suppress the symptoms that your body needs to express, while they ignore the underlying root cause. Side effects of synthetic and chemical drugs, which even if they are partly derived from nature have been perverted to make them patentable and profitable, are not healthy or natural, and usually cause more harm than any perceived benefit of the medication.

Where “physician errors” are concerned, these may not be entirely the fault of the doctors, as they are forced to operate within the constraints of their profession or risk losing their license, but doctors have become pawns and spokesmen for the drug companies, and the best interest of the patient has become secondary. In the name of profit, physicians are also under great pressure from hospitals to service patients as quickly as possible, like an assembly line, increasing the likelihood of error.

In conclusion, increases in healthcare costs are not just the result of frivolous law suits, but are primarily the result of a profit-oriented industry that encourages practices that lead to unnecessary and harmful procedures being performed, lethal adverse drug reactions, infections, expensive legitimate lawsuits, in-hospital and physician errors, antibiotic resistance due to overprescribing of antibiotics and drugs, and the hundreds of thousands of subsequent unnecessary deaths and injuries. Many people do not realize that there are healthier natural options, and anything unnatural or invasive we are exposed to is likely to cause either immediate or cumulative damage over time.

For more information on how to help your body heal itself naturally without chemicals, information on drug side effects, and harmful disease-causing chemicals in the foods you eat and your environment and how to avoid them, please visit the NatureGem web site at

About the author:

Deb Bromley is a science and technology researcher and the President of NatureGem Nontoxic Living, an organization devoted to promoting awareness of toxins in our food and environment that can cause disease, and providing access to nutrition information, natural remedies, and alternative health resources. Please visit http://www.naturegem.comfor more information.

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