That said - the way a stats program handles various calculations, to me, only seems to matter with higher level analyses (let's say anything beyond regression). There is a bit of a stats package prestige issue in academia, and for whatever reason Stata is a bit higher in the rankings than SPSS. More processors or cores make Stata/MP run faster.Reasons for Choosing Stata: I have been using Stata for years now - I switched from SPSS to Stata during my graduate program. Whether a computer has separate processors or one processor with multiple cores makes no difference. To run Stata/MP, you can use a desktop computer with a dual-core or quad-core processor, or you can use a server with multiple processors. Technical Details and System Requirements
Add your own power and sample-size methods. Power analysis for linear regression models. Power analysis for cluster randomized designs. Multiple-group SEM for continuous, binary, ordered, and count outcomes. 
Tests for multiple breaks in time series. Multilevel tobit regression for censored data. Multilevel regression for interval-censored data. Panel-data tobit with random co-efficients. Overview of StataCorp Stata MP 16 Features Most of the new features in Stata have been parallelized to run faster on Stata/MP, sometimes much faster. Stata/MP is the multiprocessor and multicore version of Stata. For a complete assessment of Stata/MP's performance, including command-by-command statistics. Some procedures are not parallelized and some are inherently sequential, meaning they run the same speed in Stata/MP. Stata/MP also allows 120,000 variables compared to 32,767 variables allowed by Stata/SE. Stata/MP can analyze 10 to 20 billion observations on the largest computers currently available and is ready to analyze up to 1 trillion observations once computer hardware catches up. Stata/SE can analyze up to 2 billion observations. Stata/MP supports up to 64 cores/processors. Stata/MP runs even faster on multiprocessor servers. Stata/MP lets you analyze data in one-half to two-thirds the time compared with Stata/SE on inexpensive dual-core laptops and in one-quarter to one-half the time on quad-core desktops and laptops. You can also FREE download IBM SPSS Statistics Overview of StataCorp Stata MP 16 Benefits Almost every computer can take advantage of the advanced multiprocessing capabilities of Stata/MP. Stata/MP is the fastest and largest version of Stata. Free Download StataCorp Stata MP 16 for Windows PC also known as Stata/MP provides the most extensive multicore support of any statistics and data management package.
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