## Archive for the ‘Statistics’ Category

September 15, 2018
“Degree days” is a measure of energy needed to cool or heat building spaces to a comfortable temperature. It is useful for planning energy costs for different locations, and is far superior than using average temperatures in which highs and lows tend to cancel eachother. The link below to the Numbers column of the Wall Street Journal is the best explanation I have seen on the subject. The second link is to a U. S. government website which is also very helpful.

How Do Energy Companies Measure the Tem…re? Not in Fahrenheit or Celsius – WSJ

https://www.eia.gov/energyexplained/index.php?page=about_degree_days

Tags:degree days, heating and cooling, HVAC, meteorology, weather change

Posted in Life Science, math article, math in the news, Statistics, statistics in news | Leave a Comment »

August 15, 2017
Quick graphs on the Ti-84 is a good way to see how data is distributed. The attached document gives step by step instructions along with an example to practice.

Making a Box Plot on the TI 84

Tags:box plots, data mining, graphical models, mathematical modeling, stem and whisker diagram

Posted in economics, Finance, graphing data, Life Science, making graphs, math education, Normal Distributions, Statistics, statistics in news, Tech Education | Leave a Comment »

June 13, 2017
The two points of view represented below are both well reasoned, conflicting, and cogent, but can they both be right? The experts currently disagree, but maybe one day the question will be answered definitively. For now, it makes for an interesting debate, and only time will tell who is right. Today’s answer may not be tomorrow’s answer.

A key question is how much data does one need in order to make smart investment decisions. Those who believe best decisions come from analyzing tons of data lean towards computer algorithms, while those who think smart evaluations don’t require looking at every piece of data lean toward human understanding and interpretation.

The term “quants,” refers to those quantitative analysts who crunch the number and are more reliant on computers and algorithms.

Why Brains Are More Reliable Than Machines – WSJ

Quants_ Best Strategy Is From the 17th Century – WSJ

Tags:AI in the news, algorithms for investing, big data, Quants, stock picking

Posted in applied engineering, computer article, computer investing, Finance, Newspaper article, science news, Statistics | Leave a Comment »

April 25, 2017
Venture Capital firms, that is, firms that invest in funding start-ups, early stage companies, and companies with good growth potential, are always on the hunt for the next great opportunity. The article below talks about the trend away from people who are expert in spotting such opportunities, and towards computer based analytics which is believed to be faster and better at finding the “next big thing.”

Venture-Capital Firms Use Big Data to Seek Out the Next Big Thing – WSJ

Tags:analytics, data mining, economic modeling, math education, mathematical modeling

Posted in coding education, computer article, computer education, Econ 101, economics, jobs in computers, Math and the market, math article, math in the news, math news, Newspaper article, Statistics, statistics in news, Statistics Readings | Leave a Comment »

April 25, 2017
“Adding Math To Save Humanities” is the title of a sidebar article in the Wall Street Journal, April 25, 2017, about liberal arts colleges trying to add more mathematical contents to traditional liberal arts courses to better prepare their graduates for the work world. Along with the Big Data revolution comes the need for employees in many diverse fields to be able to analyze data and to “rigorously and effectively” use data to answer questions. “Emory University in Atlanta has created a degree that marries traditionally qualitative disciplines such as anthropology and English with math and statistics.” This shift is in part to due students enrolling in liberal arts programs in smaller numbers. Click below for the full article.

saving liberal arts

Tags:education, liberal arts and math, math education, math news

Posted in computer education, General interest, jobs in computers, Math and the market, math article, math education, math in the news, math news, Newspaper article, Statistics, statistics in news | Leave a Comment »

March 30, 2017
In order to make any predictions in any area of study, one must make assumptions about the data, and what is likely to affect it going forward. That is why statistical studies often make use of such statements as:

“At the current rate…”

“If things continue as in the past…”

“Based on what we know now…”

“It is reasonable to assume…”

“If history is a guide…”

“If things don’t change…”

But things do change, and that is what makes predicting the future so difficult, and so vulnerable to known and unknown biases. While these caveats are unavoidable, and need to be stated, they require the consumer of the statistics to have a reasonable amount of skepticism and a large amount knowledge.

A quote in a The Great Race by Levi Tillemann states that “The available supply of gasoline, as is well know, is quite limited and it behooves the farseeing men of the motor car industry to look for likely substitutes.” This quote is attributed to Thomas J. Fay, in 1905, in a magazine call *Horseless Age*.

Tags:data mining, economics, math and finance, mathematical modeling, medical device

Posted in General interest, math article, Statistics, Statistics Readings | Leave a Comment »

September 13, 2016
In a recent study 20% of genetics research papers using Microsoft Excel have been found to have data errors due to improper data entry. It turns out that gene names such as SEPT2 and MARCH1 (these are actual gene name abbreviations used by scientists) get converted to dates by Excel and then result in rejected data. The problem is resolvable if the scientists would make sure the data cells were formatted as “Text,” prior to entering the data.

For the full article in the Washington Post click on the link below.

https://www.washingtonpost.com/news/wonk/wp/2016/08/26/an-alarming-number-of-scientific-papers-contain-excel-errors/

Tags:math article, Microsoft Excel, statistics article, Technology news, text data on Excel

Posted in General interest, Life Science, math article, math in the news, math news, Newspaper article, science news, Statistics Readings | Leave a Comment »

July 21, 2016
In simple terms, a budget **deficit** is the **difference** between what the **federal** government spends (called outlays) and what it takes in (called revenue or receipts). The **national debt**, also known as the public **debt**, is the result of the **federal** government borrowing money to cover years and years of budget **deficits**.

money.howstuffworks.com/**difference**-between-u-s-**deficit**–**national**–**debt**-.htm

Tags:Economics article, Finance article, financial news, statistics article, statistics news

Posted in Finance, math article, statistics in news, Statistics Readings | Leave a Comment »

July 19, 2016
Scientists studying sleep time of preschoolers and obesity in teenages have observed some interesting correlations, but they are not conclusively cause and effect. As reported in the New York Times, July 19, 2016.

Early Bedtime May Fight Fat NYT 7_19_16

Tags:math article, Statistics, statistics article, statistics news

Posted in Life Science, math article, math in the news, Newspaper article, statistics in news, Statistics Readings | Leave a Comment »