s.probplt(1)		      Grass User's Manual		  s.probplt(1)



NNAAMMEE
       ss..pprroobbpplloott  - Normal probability plot of a GRASS site list.
       _(_G_R_A_S_S _S_i_t_e_s _P_r_o_g_r_a_m_)

SSYYNNOOPPSSIISS
       ss..pprroobbpplloott
       ss..pprroobbpplloott hheellpp
       ss..pprroobbpplloott [--aallqq] ssiitteess==_n_a_m_e wwiiddtthh==_v_a_l_u_e [ggrraapphh==_n_a_m_e]

DDEESSCCRRIIPPTTIIOONN
       _s_._p_r_o_b_p_l_o_t does normal or lognormal probability plots of site values.

OOPPTTIIOONNSS
   FFllaaggss::
       --aa     Use  all sites found in the named _s_i_t_e_s file, rather than limit-
	      ing output  to  sites  falling  within  the  current  geographic
	      region.

       --ll     Lognormal probability plot instead of normal.

       --qq     Quiet. Cut out the chatter.


   PPaarraammeetteerrss::
       ssiitteess==_n_a_m_e
	      Name of an existing sites file.

       wwiiddtthh==_v_a_l_u_e
	      Width of bins.

       ggrraapphh==_n_a_m_e
	      Basename to save graphing data/commands files.  Graphs are saved
	      in the current working directory with  the  extensions  _._g_p  and
	      _._d_a_t


NNOOTTEESS
       The  plotting  program can be selected by setting the environment vari-
       able GGRRAASSSS__GGNNUUPPLLOOTT .

EEXXAAMMPPLLEE
       Given a sites file named _e_x_a_m_p_l_e in the following format:
       83.8|92.2|3.5689
       83.8|82.2|3.9269
       83.8|80.2|3.5389
       83.8|69.2|3.7452
	Suppose that we wish to examine normality of the  site	values	(third
       column).   The  first step is to examine minimum and maximum and deter-
       mine with the histogram bin width using ss..uunniivvaarr:


       ss..uunniivvaarr --ggqq ssiitteess==example

       This command outputs:
       n=216
       min=1.489
       max=3.9419
	along with other useful statistics.  For  this	range  and  number  of
       observations,  we randomly select 0.1 as the histogram bin width. Then,
       the following command graphs a probability plot and  saves  it  in  the
       current	working  directory  with  a  basename  of _m_y_p_l_o_t: ss..pprroobbpplltt --qq
       ssiitteess==example wwiiddtthh==0.1 ggrraapphh==myplot

       To view the graph again, try ggnnuupplloott myplot.gp

       Using  _g_n_u_p_l_o_t,	the  graphs  may  be  output  as  PostScript,	LaTeX,
       FrameMaker MIF, or many other formats.

SSEEEE AALLSSOO
       _s_._u_n_i_v_a_r

       _s_._n_o_r_m_a_l

       _g_n_u_p_l_o_t

BBUUGGSS
       Please  send  all  bug  fixes  and  comments to the author or the grass
       development team.

       http://www.geog.uni-hannover.

AAUUTTHHOORR
       James Darrell McCauley ,

       when he was at: Agricultural Engineering Purdue University

       _L_a_s_t _c_h_a_n_g_e_d_: _$_D_a_t_e_: _2_0_0_2_/_0_1_/_2_5 _0_5_:_4_5_:_3_5 _$



GRASS 5.0							  s.probplt(1)
