Patrik Silva

10 Questions 43 Answers 0 Followers

Questions related from Patrik Silva

What is the cut off value of correlation coefficient among independent variables, to be considered as collinear/high correlated variables?

Please, if someone could give me some reference papers/books I would appreciate it. Thank you in advance! PS

01 January 2019 9,215 3 View

How the predicted R-Squared is mathematically calculated?

I would like to know how the predicted R-Squared are calculate because I want to use it to determine whether I am overfitting a my regression model by including to many terms, based in Mr. Jim's...

11 November 2018 6,600 6 View

What should I do with this two outliers, which I know their causes?

Hi all, I have aggregated count data of criminal incidents in each neighbourhood of a particular city. I also have the population of each of those particulars neighbourhoods. I want to create a...

09 September 2018 9,383 8 View

Please, could someone give me some reference books of physical geography?

To specify, I want books focused on the aspects related to the field itself, geomorphology, geology, soil etc.

06 June 2018 6,538 4 View

How permutation works to calculate pseudo p-value in Moran Index (Spatial Autocorrelation)?

I want to see a real example, just to clarify my thoughts! Thank you in advance!

06 June 2018 7,871 2 View

Which function should I use to highlight low and high values in my data (variable)?

Let's I have the a have a variable "A" which range from 80 (Min) to 50000 (Max) and the mean is 2500. I want to highlight both, low values and high values. Which function should I use to weight my...

05 May 2018 696 7 View

There is any tool that can convert roads in polygon format to line (centreline)?

I have a road shapefile in polygon format and I want to take the centreline and end up with a shapefile in line format because I need the road's intersections. Thank you in advance!

05 May 2018 1,089 11 View

What is the minimum number of observations that I must have to perform a regression analysis?

I am conducting a research to explore the driving forces of crimes in a particular city. However, the city only has few zones (24). If I perform a regression analysis and have met all the...

04 April 2018 7,330 16 View

In regression analysis, should I use independent variable as a percentage or their natural units?

Let's say I have the total number of household of each zone in a particular city. I want to explore the driving forces of crimes (count data). As candidate's independent variables a have a set of...

04 April 2018 9,268 10 View

Should I normalize my independent variables in OLS regression or just use their absolute value?

I have some independent values, e.g. percentage of head of the household with low low education per zone, percentage of unemployed people per zone [...] The percentage is related to the total of...

03 March 2018 1,988 11 View