fish: fish

Description Usage Format Notes Source Examples

Description

Wooldridge Source: K Graddy (1995), “Testing for Imperfect Competition at the Fulton Fish Market,” RAND Journal of Economics 26, 75-92. Professor Graddy's collaborator on a later paper, Professor Joshua Angrist at MIT, kindly provided me with these data. Data loads lazily.

Usage

1
data('fish')

Format

A data.frame with 97 observations on 20 variables:

Notes

This is a nice example of how to go about finding exogenous variables to use as instrumental variables. Often, weather conditions can be assumed to affect supply while having a negligible effect on demand. If so, the weather variables are valid instrumental variables for price in the demand equation. It is a simple matter to test whether prices vary with weather conditions by estimating the reduced form for price.

Used in Text: pages 443, 580

Source

https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041

Examples

1

Example output

'data.frame':	97 obs. of  20 variables:
 $ prca   : num  0.622 0.972 1.233 1.929 0.803 ...
 $ prcw   : num  0.767 1.175 1.475 1.625 0.864 ...
 $ qtya   : int  1875 2900 770 927 4220 4230 3079 945 7925 4895 ...
 $ qtyw   : int  2205 566 1525 943 2665 1375 1880 1240 1395 1898 ...
 $ mon    : int  1 0 0 0 1 0 0 0 0 1 ...
 $ tues   : int  0 0 0 0 0 1 0 0 0 0 ...
 $ wed    : int  0 1 0 0 0 0 1 0 0 0 ...
 $ thurs  : int  0 0 1 0 0 0 0 1 0 0 ...
 $ speed2 : int  15 10 10 15 10 15 10 10 10 20 ...
 $ wave2  : num  7.5 5 6 6 3.5 4.5 4.5 4 4 12.5 ...
 $ speed3 : int  20 20 20 20 20 15 20 20 15 20 ...
 $ wave3  : num  9 7.5 4 5 3.5 3.5 3.5 4.5 4.5 3.5 ...
 $ avgprc : num  0.7 1.005 1.394 1.775 0.827 ...
 $ totqty : int  4080 3466 2295 1870 6885 5605 4959 2185 9320 6793 ...
 $ lavgprc: num  -0.35627 0.00532 0.33212 0.57407 -0.19019 ...
 $ ltotqty: num  8.31 8.15 7.74 7.53 8.84 ...
 $ t      : int  1 2 3 4 5 6 7 8 9 10 ...
 $ lavgp_1: num  NA -0.35627 0.00532 0.33212 0.57407 ...
 $ gavgprc: num  NA 0.362 0.327 0.242 -0.764 ...
 $ gavgp_1: num  NA NA 0.362 0.327 0.242 ...
 - attr(*, "datalabel")= chr ""
 - attr(*, "time.stamp")= chr "25 Jun 2011 23:03"
 - attr(*, "formats")= chr  "%9.0g" "%9.0g" "%9.0g" "%9.0g" ...
 - attr(*, "types")= int  254 254 252 252 251 251 251 251 251 254 ...
 - attr(*, "val.labels")= chr  "" "" "" "" ...
 - attr(*, "var.labels")= chr  "price for Asian buyers" "price for white buyers" "quantity sold to Asians" "quantity sold to whites" ...
 - attr(*, "version")= int 10

wooldridge documentation built on June 24, 2021, 9:07 a.m.