"More info:
What I mean by "price similarly" is when Airline1 prices high on a origination and destination pair, Airline3 and Airline8 also prices high."
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Grouping Similar Competitors
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Suppose we want to look at which airlines have similar pricing strategies. The data set looks like this: Variables: Flight Origination, Flight Destination, Airline1 Price, Airline2 Price,…Continue
Started this discussion. Last reply by Jason Monte Aug 29, 2012.
Hadoop and Data Mining
4 Replies
Hadoop and Big Data are buzzwords these days. How does it affect data mining workers? Should it be completely transparent for people only using analytical tools such as R, SPSS, SAS etc. in their…Continue
Started this discussion. Last reply by Ingo Mierswa Aug 15, 2012.
Independent variables need to be normally distributed in multiple regression?
5 Replies
Below is a quote regarding logistic regression. It seems it is saying OLS regression requires independent variables to be normally distributed. Based on my past experience, most independent…Continue
Started this discussion. Last reply by Sean Flanigan Jul 20, 2012.
How To Determine If A Sample Is Representative
5 Replies
If the sample is obtained through simple random sampling, would it be automatically representative of the population? If not, what is the way to determine if it is representative.Continue
Started this discussion. Last reply by Lynne Mysliwiec Jul 24, 2012.
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Grouping Similar Competitors
Suppose we want to look at which airlines have similar pricing strategies. The data set looks like this: Variables: Flight Origination, Flight Destination, Airline1 Price, Airline2 Price, ....Airline10 Price. Data:Origination: A, Destination: B, Airline1 Price=100, Airline2 = 120, ...., Airline10=95Origination: A, Destination: C, Airline1 Price=500, Airline2 = 450, ...., Airline10=505...... The expected outcome is like:Airline1, Airline3, Airline8 price similar.Airline2, Airline4 price…See More
Jason Monte posted a discussion
Grouping Similar Competitors
Suppose we want to look at which airlines have similar pricing strategies. The data set looks like this: Variables: Flight Origination, Flight Destination, Airline1 Price, Airline2 Price, ....Airline10 Price. Data:Origination: A, Destination: B, Airline1 Price=100, Airline2 = 120, ...., Airline10=95Origination: A, Destination: C, Airline1 Price=500, Airline2 = 450, ...., Airline10=505...... The expected outcome is like:Airline1, Airline3, Airline8 price similar.Airline2, Airline4 price…See More
Ingo Mierswa replied to Jason Monte's discussion Hadoop and Data Mining
"Hi Jason,
Hadoop and Big Data on itself does not really help anyone, especially not if it used on a data-management level only. So we could now store even larger data sets and we are able to retrieve them faster than before. Nice, but in principle…"
Manish Bhoge replied to Jason Monte's discussion Hadoop and Data Mining
"Jason,
You are completely right in your statement about Hadoop that it is makes data retrieval fater. But it does more than that actually. It has power of distributed computing where you have large number of CPU power to run your…"
Lynne Mysliwiec replied to Jason Monte's discussion Web Analytics vs Data Mining/Predictive Modeling
"Yes - there is a great deal of demand for data mining/predictive modeling people. Not only that, but there's competition between employers for the best talent & salaries are much better for heavy-duty quant people than they are for entry…"
Lynne Mysliwiec replied to Jason Monte's discussion How To Determine If A Sample Is Representative
"The answer is: No. No sample is guaranteed to be representative of the entire population, although the risk of non-representative samples is reduced as sample size / total N gets larger. The larger the % of the total population, the lower the…"
Ralph Winters replied to Jason Monte's discussion Hadoop and Data Mining
"I think it will foster different ways of operating on the data, to perform equivalent results. For example if you are used to doing a regression on a large sample base, you may be forced to perform separate analyses on the various subsets of…"
Miles Garnsey replied to Jason Monte's discussion Hadoop and Data Mining
"Although I don't have any great experience in the big data area, it looks like an exciting time to me. There are few current solutions which allow data scientists to effectively leverage big data without extensive understanding of the…"
Jason Monte posted a discussion
Hadoop and Data Mining
Hadoop and Big Data are buzzwords these days. How does it affect data mining workers? Should it be completely transparent for people only using analytical tools such as R, SPSS, SAS etc. in their life? I guess Hadoop and Big Data is more at the data-management level. It just makes data retrieval faster and has nothing to do with analytics.See More
Sean Flanigan replied to Jason Monte's discussion Independent variables need to be normally distributed in multiple regression?
"Sorry, I mean't the within category means of the DV, not the IV. "
Sean Flanigan replied to Jason Monte's discussion Web Analytics vs Data Mining/Predictive Modeling
"The fractional factorial is a higher end breed, more of a GLM traditionally , but there are choice modeling approaches as well (http://www.nobelprize.org/nobel_prizes/economics/laureates/2000/press.html) for these designs.
So, the research design…"
Sean Flanigan replied to Jason Monte's discussion How To Determine If A Sample Is Representative
"Social Research, where measures are not massive in certain studies, such as jury bias etc. Pharmaceutical research, where cost of data collection can be astronomical.
"
Sean Flanigan replied to Jason Monte's discussion Independent variables need to be normally distributed in multiple regression?
"Given dummy codes are not normal, would this generalize to impact the business presentation of "on average a unit increase in x produces an increase in y" if both are not normally distributed, or at least based on some fundamental…"
Ralph Winters replied to Jason Monte's discussion Independent variables need to be normally distributed in multiple regression?
"You are correct in saying most independent variables are not normally distributed in that (in classic statistics)
predictors are from designed experiments and are not random in that sense. But more importantly, the usual assumption of…"
Sean Flanigan replied to Jason Monte's discussion Independent variables need to be normally distributed in multiple regression?
"All you have to do is transform the shape of the distribution.
There can be hidden distributions within ranges of the IV. So there are techniques to transform the whole distribution, or restrict the range of the IV and transform those. All the rules…"
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