93
ECOM II
14
Obtaining help
For most active windows context sensitive help can be obtained by pressing F1,
clicking on the help button or selecting the help drop down menu.
If you have problems using the program or entering data which you cannot solve then
contact Pisces Conservation Ltd by e mail   pisces@irchouse.demon.co.uk   or by
phone to UK 44 (0)1590 676622 during office hours (09.00 to 17.00). You might also
like to consult our web site at 
www.pisces conservation.com
 where you will find
answers for many common problems.
14.1
Common errors and problems
No matter how much care is taken with data preparation, it is not unusual to
encounter problems when initially loading and running analyses on a data set. These
are usually simple to rectify. Common error messages and their solutions are shown
below
1.    is not a valid floating point value. This will occur if the raw data set holds
blank columns or rows   ones that sum to zero. Remove blank columns and rows by
using  
Handling zeros
  in the working data window. It may also occur if the raw data
holds a blank cell. In some cases ECOM will identify the problem cell which should be
edited. Normally it is because the data has been prepared in a spreadsheet using
blanks to represent zero values.
Occasionally, this error can occur because a blank space has been accidentally
entered into a cell outside the data matrix when it was being prepared in a
spreadsheet program. To prevent this happening, it is good practice, before saving
your data set as a .csv file, to highlight the first 10 or so blank rows and columns
below and to the right of the data matrix, and press  Delete . This will clear the cells of
any accidentally entered contents.
2. Data matrix disparity. If ECOM detects that the biological and environmental
data sets have different numbers of columns, then the following screen will appear,
showing where the disparity lies. In this example, Site 2 is missing from the biological
file. The options are to Delete the Unmatched Column, or to Truncate the Longest
Dataset. This will, of course result in a mismatching of sites throughout the datasets,
but it may be useful if dealing with errant entries at the end of either dataset.
Copyright 2004  PISCES Conservation Ltd





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