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Questions related from Gopalakrishna Palem
Any practical (e.g. easily implementable in R) methods for predicting the values for a given time series that account for additional/external variables influence ? For example, the no. of orders...
09 September 2014 2,677 4 View
Price-elasticity models do not fit here (since they need previous/historic data with price changes to 'learn' the effect). We have sales-data for different items (with no price-changes till now)....
04 April 2014 8,036 1 View
Given a data frame, how do I programmatically list only columns of a certain type (say, only 'factor', 'numeric', etc.)? I created a function that receives data frames. I now need to do certain...
03 March 2014 1,345 3 View
The below version does not work. It just names the column as 'colName' and not 'weekDay'. addWeekDay
03 March 2014 3,272 7 View
In R, I am using Min and Max to find minimum and maximum values for a given vector. This vector is a result of computation and filter and often times could be NULL or empty list. In such case,...
09 September 2013 5,090 3 View
Here is the situation: We have multiple students and different subjects. The goal is to find the "consistent performer" ranking for the students based on their whole year performance in...
07 July 2013 6,539 5 View