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From |
Michael Norman Mitchell <Michael.Norman.Mitchell@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: What multiple regression model for extreme distributions |

Date |
Tue, 02 Feb 2010 12:59:27 -0800 |

Dear Muhammed

Best regards, Michael N. Mitchell See the Stata tidbit of the week at... http://www.MichaelNormanMitchell.com Visit me on Facebook at... http://www.facebook.com/MichaelNormanMitchell muhammed abdul khalid wrote:

Hi, Thank you for the replies. The data is cross sectional, and saving is simply measured based on respondents answer on how much saving they have ( in dollars) with the minimum being zero. There is no negative saving. Yes, saving is my dependent variable. I tried logit, zip, zinb, nbreg but their std error varies greatly. Still unsure to what model should be used. My objective is to predict the contribution of education, gender, location and ethnicity to saving of the household. Thank you again for kind response. Muhammed SciencesPo Paris. 2010/2/2 Austin Nichols <austinnichols@gmail.com>:You have had a number of good suggestions already, but as Nick Cox points out, the distribution of the dependent variable is not all that relevant to what model you choose; it is the distribution of the dependent variable conditional on explanatory variables that is important. Before you estimate a two-part "hurdle" or zero-inflated model, I urge you to consider that the right set of explanatory variables might well capture the reason for a large number of zero outcomes (e.g. using -poisson- instead of -zip- etc.). When it comes to household saving (I think that is your dependent variable, not independent), you also want to consider debt. It may be the case that households you are coding as zeros actually have negative saving during the period under study. Do you have panel data, or cross-sectional data? How is saving measured? On Tue, Feb 2, 2010 at 10:09 AM, <muhammed.abdulkhalid@gmail.com> wrote:I have a household income survey data ( 38,000 observations), and my problem is doing a multiple regression on saving ( independent var) to ethnicity/strata/employment etc( dependent var). The problem is this : 70% of my observation for the value of saving is zero. I had recode it to 1 and log them, but the distribution is still extremely skewed ( mean 0.78, std dev is 2.4 min 0 max 14). The historgam still looks like the letter L , exteremly skewed to the right with long tail. Obviously, OLS is out, and I tried Poisson( glm nbinomial) but the distribution is still not distributed normally. The data are in order i.e no missing values etc etc. It is clean.For some reason, lobit would not run.* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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**References**:**st: What multiple regression model for extreme distributions***From:*muhammed abdul khalid <muhammed.abdulkhalid@gmail.com>

**Re: st: What multiple regression model for extreme distributions***From:*Austin Nichols <austinnichols@gmail.com>

**Re: st: What multiple regression model for extreme distributions***From:*muhammed abdul khalid <muhammed.abdulkhalid@gmail.com>

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