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st: RE: standard normal distribution
From
"Cohen, Elan" <[email protected]>
To
"[email protected]" <[email protected]>
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: [email protected] [mailto:[email protected]] On Behalf Of tashi lama
Sent: Monday, August 27, 2012 11:56
To: [email protected]
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
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