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>stats_cdf_beta</H1
><DIV
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><A
NAME="AEN219730"
></A
><P
>    (PECL)</P
>stats_cdf_beta&nbsp;--&nbsp;CDF function for BETA Distribution. Calculates any one parameter of the beta distribution given values for the others.</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN219733"
></A
><H2
>说明</H2
>float <B
CLASS="methodname"
>stats_cdf_beta</B
> ( float par1, float par2, float par3, int which )<BR
></BR
><P
>&#13;
                              Method

     Cumulative distribution function  (P)  is calculated directly by
     code associated with the following reference.

     DiDinato, A. R. and Morris,  A.   H.  Algorithm 708: Significant
     Digit Computation of the Incomplete  Beta  Function Ratios.  ACM
     Trans. Math.  Softw. 18 (1993), 360-373.

     Computation of other parameters involve a search for a value that
     produces  the desired  value  of P.   The search relies  on  the
     monotinicity of P with the other parameter.

                              Note

     The beta density is proportional to
               t^(A-1) * (1-t)^(B-1)

                              Arguments


     P -- The integral from 0 to X of the chi-square
            distribution.
            Input range: [0, 1].

     Q -- 1-P.
            Input range: [0, 1].
            P + Q = 1.0.

     X -- Upper limit of integration of beta density.
            Input range: [0,1].
            Search range: [0,1]

     Y -- 1-X.
            Input range: [0,1].
            Search range: [0,1]
            X + Y = 1.0.

     A -- The first parameter of the beta density.
            Input range: (0, +infinity).
            Search range: [1D-100,1D100]

     B -- The second parameter of the beta density.
            Input range: (0, +infinity).
            Search range: [1D-100,1D100]

     STATUS  -- 0 if calculation completed correctly
               -I if input parameter number I is out of range
                1 if answer appears to be lower than lowest
                  search bound
                2 if answer appears to be higher than greatest
                  search bound
                3 if P + Q .ne. 1
                4 if X + Y .ne. 1

     BOUND  -- Undefined if STATUS is 0

               Bound exceeded by parameter number I if STATUS
               is negative.

               Lower search bound if STATUS is 1.

               Upper search bound if STATUS is 2.

  </P
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><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>par1</CODE
></DT
><DD
><P
>&#13;       Its description
      </P
></DD
><DT
><CODE
CLASS="parameter"
>par2</CODE
></DT
><DD
><P
>&#13;       Its description
      </P
></DD
><DT
><CODE
CLASS="parameter"
>par3</CODE
></DT
><DD
><P
>&#13;       Its description
      </P
></DD
><DT
><CODE
CLASS="parameter"
>which</CODE
></DT
><DD
><P
>&#13;      Integer indicating which of the next four argument
               values is to be calculated from the others.
               Legal range: 1..4
               iwhich = 1 : Calculate P and Q from X,Y,A and B
               iwhich = 2 : Calculate X and Y from P,Q,A and B
               iwhich = 3 : Calculate A from P,Q,X,Y and B
               iwhich = 4 : Calculate B from P,Q,X,Y and A

      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN219775"
></A
><H2
>返回值</H2
><P
>&#13;     STATUS  -- 0 if calculation completed correctly
               -I if input parameter number I is out of range
                1 if answer appears to be lower than lowest
                  search bound
                2 if answer appears to be higher than greatest
                  search bound
                3 if P + Q .ne. 1
                4 if X + Y .ne. 1
  </P
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