NAME:  fishcatch
TYPE:  Sample 
SIZE:  159 observations, 8 variables

DESCRIPTIVE ABSTRACT:

159 fishes of 7 species are caught and measured. Altogether there are
8 variables.  All the fishes are caught from the same lake
(Laengelmavesi) near Tampere in Finland.

SOURCES:
Brofeldt, Pekka: Bidrag till kaennedom on fiskbestondet i vaera
        sjoear. Laengelmaevesi. T.H.Jaervi: Finlands Fiskeriet  Band 4,
        Meddelanden utgivna av fiskerifoereningen i Finland.
        Helsingfors 1917

VARIABLE DESCRIPTIONS:

1  Obs       Observation number ranges from 1 to 159
2  Species   (Numeric)
        Code Finnish  Swedish    English        Latin      
         1   Lahna    Braxen     Bream          Abramis brama
         2   Siika    Iiden      Whitewish      Leusiscus idus
         3   Saerki   Moerten    Roach          Leuciscus rutilus
         4   Parkki   Bjoerknan  ?              Abramis bjrkna
         5   Norssi   Norssen    Smelt          Osmerus eperlanus
         6   Hauki    Jaedda     Pike           Esox lucius
         7   Ahven    Abborre    Perch          Perca fluviatilis

3  Weight      Weight of the fish (in grams)
4  Length1     Length from the nose to the beginning of the tail (in cm)
5  Length2     Length from the nose to the notch of the tail (in cm)
6  Length3     Length from the nose to the end of the tail (in cm)
7  Height%     Maximal height as % of Length3
8  Width%      Maximal width as % of Length3
9  Sex         1 = male 0 = female



          ___/////___                  _
         /           \    ___          |
       /\             \_ /  /          H
     <   )            __)  \           |
       \/_\\_________/   \__\          _

     |------- L1 -------|
     |------- L2 ----------|
     |------- L3 ------------|


Values are aligned and delimited by blanks.
Missing values are denoted with NA.
There is one data line for each case.

SPECIAL NOTES:
I have usually calculated
           Height =  Height%*Length3/100
           Widht  =  Widht%*Length3/100


PEDAGOGICAL NOTES:
I have mainly used only  Species=7 (Perch) and here is some of the
models and test, we have used

      Weight=a+b*(Length3*Height*Width)+epsilon
         Ho: a=0;
         Heteroscedastic case. Question: What is proper weighting, 
         if you use Length3 as a weighting variable.

      Log(Weight)=a+b1*Length3+epsilon

      Weight^(1/3)=a+b1*Length3+epsilon
      (Given by Box-Cox-transformation)
         Ho: a=0;

      Log(Weight)=a+b1*Length3+b2*Height+b3*Width+epsilon
         Ho: b1+b2+b3=3;  
         i.e. dimension of the fish = 3

      Weight^(1/3)=a+b1*Length3+b2*Height+b3*Width+epsilon
      (Given by Box-Cox-transformation)
         Ho: a=0;

      Weight=a*Length3^b1*Height^b2*Width^b3+epsilon
         Nonlinear, heteroscedastic case.
         What is proper weighting?

      Is obs 143

      143  7  840.0 32.5  35.0  37.3  30.8  20.9  0

      an outlier? It had in its stomach 6 roach.



REFERENCES:
Brofeldt, Pekka: Bidrag till kaennedom on fiskbestondet i vaara
        sjoear. Laengelmaevesi. T.H.Jaervi: Finlands Fiskeriet  Band 4,
        Meddelanden utgivna av fiskerifoereningen i Finland.
        Helsingfors 1917


SUBMITTED BY:
Juha Puranen
Departement of statistics
PL33 (Aleksanterinkatu 7)
000014 University of Helsinki
Finland
e-mail: jpuranen@noppa.helsinki.fi