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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Data from a soldering experiment</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for solder {survival}"><tr><td>solder {survival}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Data from a soldering experiment</h2> <h3>Description</h3> <p>In 1988 an experiment was designed and implemented at one of AT&T's factories to investigate alternatives in the "wave soldering" procedure for mounting electronic componentes to printed circuit boards. The experiment varied a number of factors relevant to the process. The response, measured by eye, is the number of visible solder skips. </p> <h3>Usage</h3> <pre>data("solder")</pre> <h3>Format</h3> <p>A data frame with 900 observations on the following 6 variables. </p> <dl> <dt><code>Opening</code></dt><dd><p>the amount of clearance around the mounting pad (3 levels)</p> </dd> <dt><code>Solder</code></dt><dd><p>the amount of solder (Thick or Thin)</p> </dd> <dt><code>Mask</code></dt><dd><p>type and thickness of the material used for the solder mask (A1.5, A3, A6, B3, B6)</p> </dd> <dt><code>PadType</code></dt><dd><p>the geometry and size of the mounting pad (10 levels)</p> </dd> <dt><code>Panel</code></dt><dd><p>each board was divided into 3 panels</p> </dd> <dt><code>skips</code></dt><dd><p>the number of skips</p> </dd> </dl> <h3>Details</h3> <p>This data set is used as a detailed example in chapter 1 of Chambers and Hastie. Observations 1-360 and 541-900 form a balanced design of 3*2*10*3= 180 observations for four of the pad types (A1.5, A3, B3, B6), while rows 361-540 match 3 of the 6 Solder*Opening combinations with pad type A6 and the other 3 with pad type A3. </p> <h3>References</h3> <p>J Chambers and T Hastie, Statistical models in S. Chapman and Hall, 1993. </p> <h3>Examples</h3> <pre> data(solder) # The balanced subset used by Chambers and Hastie # contains the first 180 of each mask and deletes mask A6. index <- 1 + (1:nrow(solder)) - match(solder$Mask, solder$Mask) solder.balance <- droplevels(subset(solder, Mask != "A6" & index <= 180)) </pre> <hr /><div style="text-align: center;">[Package <em>survival</em> version 2.44-1.1 <a href="00Index.html">Index</a>]</div> </body></html>