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# st: standard normal distribution

 From tashi lama To Subject st: standard normal distribution Date Mon, 27 Aug 2012 15:56:06 +0000

```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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```

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