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I have just one more question.
LCLM= mean - 1.96*std_dev/(N)^0.5?
UCLM =mean - 1.96*std_dev/(N)^0.5?
If so, why do I have an output like this?
N=19
Mean= 2.57046
StdDev= 0.11615
LCLM= 2.51447
UCLM = 2.62644 ?
It shouldn't be:
LCLM= 2.57046-(1.96*0.11615)/(19^0.5) = 2.518233
UCLM = 2.57046+(1.96*0.11615)/(19^0.5) = 2.622687 ????
On 14 Jul, 10:55, Nanita <susana.urb...@gmail.com> wrote:
> Hi all,
>
> I have this code to calculate the confidence bands of set of data.
>
> proc means data =sort_ic
> fw=12
> printalltypes
> printidvars
> alpha=0.05
> vardef=NF
> chartype
> mean
> std
> clm;
>
> var V_ASK V_BID V_MID;
>
> by codigo_param prazo;
> id codigo_param prazo;
>
> output out=sort_ic_source
> mean()=
> std()=
> lclm()=
> uclm()=
> / autoname autolabel inherit
> ;
> run;
>
> My question is... what is the destribuition used? Normal(0,1)??
>
> Thanks in advance
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