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From |
"Cohen, Elan" <cohened@upmc.edu> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: standard normal distribution |

Date |
Mon, 27 Aug 2012 17:15:25 +0000 |

Tashi, You did not generate Normal random values, but calculated values of the Normal density. As always, it's extremely helpful to see which commands you used. You want to use the -rnormal()- function to generate values from a Normal distribution, not -normalden()-. HTH, - Elan -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of tashi lama Sent: Monday, August 27, 2012 11:56 To: statalist@hsphsun2.harvard.edu Subject: st: standard normal distribution Hello all, This might be more of a statistical question than stata but I would really appreciate if someone explain me this. I thought I understood normal distribution until I see this. I have a standard normal distribution table with N(mean=0,standard deviation=1) which gives me the following x y |---------------| | -9 1.03e-18 | | -8 5.05e-15 | | -7 9.14e-12 | | -6 6.08e-09 | | -5 1.49e-06 | |---------------| | -4 .0001339 | | -3 .004433 | | -2 .0540047 | | -1 .2420321 | | 0 .3990434 | |---------------| | 1 .2420321 | | 2 .0540047 | | 3 .004433 | | 4 .0001339 | | 5 1.49e-06 | |---------------| | 6 6.08e-09 | | 7 9.14e-12 | | 8 5.05e-15 | | 9 1.03e-18 | | 10 7.70e-23 | +---------------+ summ y Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- y | 20 .0500127 .1105588 7.70e-23 .3990434 Do I not must get mean of y to be 0 and standard deviation to be 1 since it is a normal distribution N(0,1). Am I misunderstanding something here?? Thanks, Tashi * * 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/ * * 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/

**References**:**st: standard normal distribution***From:*tashi lama <ltashi32@hotmail.com>

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