Webapp for finding out how large your penis really is

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gen_percentiles.R

library(mvtnorm)

# Girth and Length are now set by values determined in either:
# Hungfun's charts (http://imgur.com/a/3r5sH)
# Herbenick et al (http://onlinelibrary.wiley.com/doi/10.1111/jsm.12244/abstract)
percentile = function (l_mean, l_sd, g_mean, g_sd, correlation) {
  covariance = correlation * l_sd * g_sd # correlation coefficient * sd(length) * sd(girth)
  sigma = matrix(c(l_sd^2, covariance, covariance, g_sd^2),nrow = 2, byrow=T)

  grange = seq(2,8, by=.1)
  lrange = seq(2,10, by=.1) 
  result = c()

  for(l in lrange) {
    for (g in grange) {
      p = 1-pmvnorm(c(l,g), mean=c(l_mean, g_mean), sigma=sigma)[1]
      result = cbind(result, c(l, g, p))
    }
  }
  result = t(result)
  colnames(result) = c("length", "girth", "percentile")
  result
}

vol_sim = function(l_mean, l_sd, g_mean, g_sd, correlation, n=1000000) {
  covariance = correlation * l_sd * g_sd # correlation coefficient * sd(length) * sd(girth)
  sigma = matrix(c(l_sd^2, covariance, covariance, g_sd^2),nrow = 2, byrow=T)
  # simulate volume
  sim = rmvnorm(n, mean=c(l_mean, g_mean), sigma=sigma)
  vol = sim[,1] * (sim[,2]/2/pi)^2*pi
  vol_cdf = ecdf(vol)
  vol_range = seq(0,35,by=0.01)
  vol_quant = vol_cdf(vol_range)
  vol_mat = cbind(vol_range, vol_quant)
  colnames(vol_mat) = c("volume", "percentile")
  vol_mat
}

hungfun = percentile (5.76, 0.83, 4.67, 0.54, .46)
write.csv(hungfun, "hungfun.csv", row.names = F) 

herbenick = percentile(5.57, 1.04, 4.81, 0.88, .46)
write.csv(herbenick, "herbenick.csv", row.names = F)


hungfun_vol = vol_sim(5.76, 0.83, 4.67, 0.54, .46)
write.csv(hungfun_vol, "hungfun_vol.csv", row.names=FALSE)

herbenick_vol = vol_sim(5.57, 1.04, 4.81, 0.88, .46)
write.csv(herbenick_vol, "herbenick_vol.csv", row.names=FALSE)

herbenick.csv

herbenick_hist.csv

herbenick_vol.csv

herbenick_vs_hung.R

# Data from http://onlinelibrary.wiley.com/doi/10.1111/jsm.12244/abstract
stats = read.csv("herbenick_hist.csv", header=T)

x = seq(1, 26, 1)
len_x = dnorm(x, 14.15, 2.66)
girth_x = dnorm(x, 12.23, 2.23)
hung_len = dnorm(x, 14.63, 2.11)
hung_girth = dnorm(x, 11.86, 1.37)
# convert cm to in
x = x * 0.393701

plot(stats[,1], stats[,2]/100, type="l", col="blue", xlim = c(0,29), ylim=c(0,.3), xlab="Inches", ylab="Percent", main="Penis measurements in Herbenick et al vs hungfun charts")
lines(x,len_x, type="l", lty=2, col="blue")
lines(x,hung_len, type="l", lty=3, col="blue")
lines(stats[,1],stats[,3]/100, type="l", col="red")
lines(x, girth_x, type="l", col="red", lty=2)
lines(x,hung_girth, type="l", lty=3, col="red")
legend("topright", c("observed length", "fit length", "hungfun length", "observed girth", "fit girth", "hungfun girth"), col=c(rep("blue", 3), rep("red", 3)), lty = c(1,2,3,1,2,3))

hungfun.csv

hungfun_vol.csv

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<html>
  <head>
    <script src="d3.v3.min.js" charset="utf-8"></script>
    <title>Super Complicated Dick Size Percentile Calculator</title>
    <style>
      table,th,td {
        border: 1px solid grey;
        border-collapse:collapse;
        padding: 5px;
      }
    </style>
  </head>
  <body>
    <h1>Joint Length+Girth and Volumetric Percentiles</h1>
    <h3>How many dudes have penises that are both longer and girthier than yours? Enter your numbers and find out!</h3>
    <p>
    * All inputed values are rounded to the nearest 10th of an inch. Volume calculations assumes errbody got a perfectly cylindrical dick.
    </p>

    <div>
      <form>
        Dataset:
        <select id="dataset">
          <option value="hungfun">Hungfun Average</option>
          <option value="herbenick">Herbenick et al, 2013</option>
        </select><br />
        Length: <input type="number" id="length" name="length" placeholder="Erect Length (in)"><br />
        Girth: <input type="number" id="girth" name="girth" placeholder="Erect Girth (in)"><br />
      </form>
    </div>


    <div id="result">
      <h2 id="percent"></h2>
      <h4 id="thousand"></h4>
      <h3 id="volume"></h3>
      <h4 id="vol-thousand"</h4>
    </div>
    <hr>
    <h3>More Information</h3>
    <div>
      <p>These percentiles are reported assuming that penis length and girth are distributed normally with the following parameters:<br />
      <table>
        <tr>
          <th>
          </th>
          <th>
            <a href="http://imgur.com/a/3r5sH">Hungfun's clinical averages</a>
          </th>
          <th>
            <a href="http://onlinelibrary.wiley.com/doi/10.1111/jsm.12244/full">Herbenick et al, 2013</a>
          </th>
        </tr>
        <tr>
          <th>
            Length in inches: mean (sd)
          </th>
          <td>5.76(0.83)
          </td>
          <td>5.57 (1.04)
          </td>
        </tr>
        <tr>
          <th>
            Girth in inches: mean (sd)
          </th>
          <td>4.67 (0.54)
          </td>
          <td>4.81 (0.88)
          </td>
        </tr>

      </table>
      </p>
      <p>
      Hungfun's chart culls data only from studies utilizing clinical measurements. Herbenick's study uses self-reported measurements for the purposes of condom sizing. According to Herbenick, the study participants had a vested interest in correctly measuring in order to obtain a custom fit condom. Although Hungfun's parameters are innately more trustworthy due to standardized measuring practices, Herbenick's data may better represent the self-measured penis size. You can use Herbenick's <a href="http://i.imgur.com/e4sH9UQ.png">measuring instructions</a> if you'd like to use their dataset.
      </p>
      <p>
      There is some evidence that clinical measurements of penis girth are lower than self-reported measurements of girth. That's not really surprising-- a doctor with a ruler in his hand isn't the most sexually stimulating thing for many men.
      </p>
      <p>
      <img src="http://i.imgur.com/rUPekgi.png"><br />
      Figure 1. A comparison of observed and gaussian fit data from the Herbenick study vs Hungfun's averages.

      </p>
      <p>
      <img src="http://i.imgur.com/YxJHD9W.png"> <br />
      Figure 2. The distribution of penis size with respect to length and girth (darker shades of blue are more common). This image was generated using parameters set in Hungfun's charts.
      </p>
      <p>
      <img src="http://i.imgur.com/fsxAkYE.png"> <br />
      Figure 3. A distribution of penis volume calculated from the multivariate distribution in the image above. It assumes your dick is a cylinder, so your actual volume is gonna be lower. This image was generated using parameters set in Hungfun's charts.
      </p>
      <p>
      More methodology is described <a href="http://www.reddit.com/r/bigdickproblems/comments/1zphzn/you_know_your_length_percentile_and_your_girth/">here</a>. <br />
      To find out how many people are longer or thicker, check out <a href="http://howlongismyschlong.com">howlongismyschlong.com</a><br />
      Source code can be found at <a href="https://gist.github.com/abovethemean/9395398/">github</a>
      </p>
    </div>
    <script>

      var datasetSelect = d3.select("select#dataset");
      var setData = function () {
        var percentileCsv;
        var volumeCsv;
        if (datasetSelect.node().value == "herbenick") { 
          percentileCsv = "herbenick.csv";
          volumeCsv = "herbenick_vol.csv";
        }
        else {
          percentileCsv = "hungfun.csv";
          volumeCsv = "hungfun_vol.csv";
        }

        d3.csv(percentileCsv, function(data) {
          d3.csv(volumeCsv, function(volData) {
            var nest = d3.nest()
            .key(function(d) {return d.length})
            .key(function(d) {return d.girth})
            .map(data);

            var volNest = d3.nest()
            .key(function(d) {return d.volume})
            .map(volData);
            var resultDiv = d3.select("div#result");


            var calc = function () {
              var length = d3.select("#length").node().value;
              var girth = d3.select("#girth").node().value;
              var roundLength = d3.round(length,1);
              var roundGirth= d3.round(girth,1);
              console.log(length);
              console.log(typeof(length));
              console.log(roundLength);

              if(length && girth) {
                var percentile = 0;
                if (roundLength >= 2 && roundLength <= 10 && roundGirth >= 2  && roundGirth <= 8) {
                  percentile = parseFloat(nest[roundLength][roundGirth][0].percentile);
                }
                else if (roundGirth > 8 || roundLength > 10) {
                  percentile = 1;
                }
                resultDiv.select("h2#percent").text(function() {
                  return d3.round(percentile*100,2) + "%"
                });
                resultDiv.select("h4#thousand").text(function() {
                  var numGuys = 1000 - d3.round(percentile * 1000, 0); 
                  return "In a room of 1000 guys, " + numGuys + " should be both longer and girthier than you.";
                });

                var volume = roundLength * Math.pow((roundGirth / 2 / Math.PI), 2) * Math.PI;
                var volRound = d3.round(volume,2);
                console.log(volNest);
                resultDiv.select("h3#volume").html(function() {
                  var floz = d3.round(volRound * 0.554113,2);
                  return "Your dick is at most " + volRound + " in<sup>3</sup> ("+floz+" fl oz)";
                });
                resultDiv.select("h4#vol-thousand").text(function () {
                  var volPercentile = 0;
                  if (volRound < 0) {
                    volPercentile = 0;
                  }
                  else if (volRound <= 35) {
                    volPercentile = d3.round(volNest[volRound][0].percentile * 100,2);
                  }
                  else {
                    volPercentile = 100;
                  }
                  return "That's more voluminous than " + volPercentile + "% of dudes!";

                });
              }


            }

            d3.selectAll('input').on('change', calc);
            calc();
          });
        });
      }
      setData();
      datasetSelect.on('change', setData);

    </script>
  </body>
</html>