sites.occur(1)		      Grass User's Manual		sites.occur(1)



NNAAMMEE
       ssiitteess..ooccccuurr   -	Description  of the site occurrence report produced by
       _s_._m_e_n_u.

DDEESSCCRRIIPPTTIIOONN
       This is a discussion of the site occurrence report produced by  _s_._m_e_n_u_.

SSAAMMPPLLEE OOUUTTPPUUTT
				    SITE OCCURRENCE REPORT
			       Yakima Firing Center, Washington

       Location:  yakima
       Mapset:	  sample
       Site List: arch_erosion - archeology (34 sites)

       Analysis Region:
			   north: 5199975.00
	  west:  692975.00			 east:	737975.00
			   south: 5154975.00

       ============================================================================

       Layer: arch_survey	   Archeologic Survey Areas (arch_survey)

       cells in analysis region:     810000
       sites in analysis region:	 34

									    degrees
				    cells	%      expected  actual    chi
       of
       Site Characteristics	    cover    cover    sites	sites	square
       freedom
       --------------------	    -------  -------  -------- ------ --------
       -------
       (  0) No data		    764310			11

       (  1) Hartmann,phase 1	     25821    56.5	19.2	   6	 9.088
       1
       (   2)  Hartmann,phase  2	11032	 24.1	   8.2	   14	 4.084
       1
       (  3) Wapora,phase 3	      8837    19.3	 6.6	   3	 1.945
       1
				   -------  -------  --------  ------ --------
       -------
	     Totals		     45690   100.0	34.0	  23	15.117
       2

       ============================================================================


EEXXPPLLAANNAATTIIOONN
       The "Site Occurrence Report" provides aggregate site information  orga-
       nized by raster map layers.


       The report header contains the following information:

       LLooccaattiioonn
	      GRASS database location (e.g., yakima),

       MMaappsseett GRASS mapset (e.g., sample)

       AAnnaallyyssiiss RReeggiioonn
	      the  rectangular	area in which the analysis was run, reflecting
	      the current geographic settings of the user's mapset.

       SSiittee LLiisstt
	      name and description of the site list used for  the  report  and
	      the  number  of  sites in the list.  See manual entry for _s_._m_e_n_u
	      for more discussion about these site lists.

       The rest of the report is divided into reports for each raster map lay-
       ers  specified  by the user.  In this SAMPLE OUTPUT, only one map layer
       (arch_survey) was specified.


       Certain information heads up each of these reports:

       llaayyeerr  identifies the raster map layer along with the map layer	TITLE.

       cceellllss iinn aannaallyyssiiss rreeggiioonn
	      the size of the analysis region (in cells).

       ssiitteess iinn aannaallyyssiiss rreeggiioonn
	      the number of sites in the analysis region.

       For  each  map layer category which occurs in a cell falling within the
       boundaries of the analysis region, as well as totals for the map  layer
       as a whole, various statistics are presented:

       SSiittee CChhaarraacctteerriissttiiccss
	      These  are  the numbers (i.e., values) and names (i.e., descrip-
	      tions) for each category (i.e., characteristic) which occurs  in
	      the map layer.

       cceellllss ccoovveerr
	      the  number  of cells in the analysis region having the category
	      value (i.e., site characteristic).

       %% ccoovveerr
	      the predominance of the category within the analysis region.

       eexxppeecctteedd ssiitteess
	      the number of sites  in  the  analysis  region  which  would  be
	      expected	to  be observed having the category value if all sites
	      were evenly distributed by in the region.

       aaccttuuaall ssiitteess
	      the number of sites in the analysis region which	were  occurred
	      in cells having the category value.

       cchhii ssqquuaarree
	      gives  the  user	a  statistical test of the hypothesis that For
	      this hypothesis to be true, the chi-square test must fail  since
	      we  are  calculating  expected sites according to the hypothesis
	      that

       ddeeggrreeeess ooff ffrreeeeddoomm
	      Number of degrees of freedom for the chi-square test.  Each cat-
	      egory  value  will  have	1 degree of freedom, and can be tested
	      alone.  The entire map layer will have 1 less degree of  freedom
	      than the number of categories.


NNOOTTEE
       Category zero (0) throughout GRASS represents "no data".  Therefore, it
       is reported, but not included in the totals or in  the  computation  of
       the chi-square statistics.

SSEEEE AALLSSOO
       _s_._d_b_._r_i_m

       _s_._i_n_._a_s_c_i_i

       _s_._m_e_n_u

       _s_._o_u_t_._a_s_c_i_i

       _s_._s_u_r_f_._i_d_w

       _s_i_t_e_s_._S

       _s_i_t_e_s_._f_o_r_m_a_t

       _s_i_t_e_s_._r_e_p_o_r_t

       _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							sites.occur(1)
