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+#Methodology and Results
+The task at hand was to develop a model which predicted whether individuals make over $50,000 per year based on the census variables provided.
+Before construction of a model, it was necessary to manage then extract the data from its original .sqlite form. The open source anlaytic environment
+of choice was R, where the RSQLite and sqldf libraries were utilized to work with the .sqlite database. After flattening the database into a single 
+table, using SQL join commands, the table was exported to a CSV file, then imported back into R. The conversion to a CSV file was important,
+as this file format was far more efficient to manipulate. A simple exploratory analysis was performed to achieve a better understanding of the data.
+Visuals such as histograms, boxplots, and density plots were created within the code below. The data was split into training, validation, and test 
+data sets, and a logisitc regression model was created for the training data set. Visuals were attempted for this logistic training data, however, 
+several commands found through online resources were not accepted by the current version of RStudio. Speaking of online resources, most of the code
+was derived from online documents or R specific books. Little to no domain knowledge was present, therefore further analysis of the data was stunted. 
+The code allows for the intercept, estimate, and standard error to be accessible for the logistic training data, and a ggplot of age vs. over_50k was
+produced. The code parallel to the above methodology is written below. 
+
+
+#Installed libraries and packages that I thought would be useful
+library("RSQLite")
+install.packages("sqldf")
+install.packages("XLConnect")
+library(sqldf)
+library(ggplot2)
+
+#Found this function online, I think it allows R to use SQL
+runsql <- function(sql, dbname="C:/Users/Pooja Aphale/Desktop/exercises/exercise01/exercise01.sqlite")
+  
+#Found this function online, it creates temporary in-memory database
+ex1 <- dbConnect(SQLite(), dbname = "C:/Users/Pooja Aphale/Desktop/exercises/exercise01/exercise01.sqlite")
+
+#Not sure if this just replicated what I did above
+sqldf("attach 'exercise01.sqlite' as new")
+
+#Thought this was summary of information inside, but it is summary of SQLite such as version, etc. 
+summary(ex1)
+
+#This option lists the tables in the database, looks like there are the following:
+#countries, education_levels, marital_statuses, occupations, races, records, relationships, sexes, and workclasses
+dbListTables(ex1)
+
+#Now we will create dataframe for every table we read in, and name the data frame
+countries <- dbReadTable(ex1, "countries")
+education_levels <- dbReadTable(ex1, "education_levels")
+marital_statuses <- dbReadTable(ex1, "marital_statuses")
+occupations <- dbReadTable(ex1, "occupations")
+races <- dbReadTable(ex1, "races")
+records <- dbReadTable(ex1, "records")
+relationships <- dbReadTable(ex1, "relationships")
+sexes <- dbReadTable(ex1, "sexes")
+workclasses <- dbReadTable(ex1, "workclasses")
+
+#Flattened the database to a single table
+flat_table <- sqldf("select * from records
+    left join countries on records.country_id=countries.id
+    left join education_levels on records.education_level_id=education_levels.id 
+    left join marital_statuses on records.marital_status_id=marital_statuses.id
+    left join occupations on records.occupation_id = occupations.id
+    left join races on records.race_id = races.id
+    left join relationships on records.relationship_id = relationships.id
+    left join sexes on records.sex_id = sexes.id
+    left join workclasses on records.workclass_id = workclasses.id")
+
+#Export flat_table to a CSV file, message in R said that it ignored col.names but not sure why
+write.csv(flat_table, "C:/Users/Pooja Aphale/Desktop/exercises/exercise01/flat_table.csv", row.names=TRUE,col.names=TRUE)
+
+#Cleaned up column names and deleted repetitive data when CSV was opened in Excel
+#Import cleaned CSV into R
+data = read.csv("C:/Users/Pooja Aphale/Desktop/exercises/exercise01/flat_table.csv")
+
+#Explore data and generate summary statistics
+summary(data)
+
+#Generate statistical graphs based on summary statistics for a few variables
+require(ggplot2)
+hist(data$age, main = "Age Histogram", xlab = "Age")
+hist(data$race_id, main = "Race Histogram", xlab = "Race")
+hist(data$gender_id, main = "Gender Histogram", xlab = "Gender")
+plot(hours_week ~ age, data = data)
+plot(age ~ capital_gain, data = data)
+boxplot(data$hours_week)
+boxplot(data$race_id)
+ggplot(data = data) + geom_density(aes(x=age))
+ggplot(data = data) + geom_density(aes(x=capital_gain))
+
+#Splitting data into training, validation, and test 
+#We have 48842 rows
+nrow(data)
+#Based on the default in Matlab, I will split approximately 70:15:15
+index <- 1:nrow(data)
+trainingindex <- sample(index, 34190)
+training <- data[trainingindex,]
+validationindex <- sample(index, 7326)
+validation <- data[validationindex,]
+testindex <- sample(index, 7326)
+test <- data[textindex,] 
+
+#Develop a model that predicts whether individuals make over $50k
+logistic_training <- glm(training$over_50k ~ training$age + training$education_num + training$capital_gain + 
+                           training$capital_loss + training$hours_week + training$country + training$education
+                         + training$marital + training$job + training$race + training$relationship + training$gender +
+                           training$workclass, data=training, family=binomial(link="logit"))
+
+#Below command stated 2 coefficients not defined because of singularities
+#Those 2 were: Some college education & Without pay workclass
+#Not sure how to fix this
+summary(logistic_training)
+
+#Create coefficient plot, R error stated that there is no package called coefplot...so that's peculiar
+require(coefplot)
+coefplot(logistic_training)
+
+#Try drawing curve based on predictions, resulted in many errors
+curve(predict(logistic_training,data.frame(age=x),type="resp"),add=TRUE)
+
+#Try drawing points, error is that x and y lengths differ
+points("age",fitted(logistic_training),pch=20)
+
+#Try a histogram and curve combo, R error said could not find function logi.hist.plot
+logi.hist.plot(age,over_50k,boxp=FALSE,type="hist",col="gray")
+
+#Trying simple plots
+plot(training$capital_gain,training$over_50k,pch=20)
+plot(training$age,training$over_50k,pch=20)
+
+#Trying the ggplot option
+ggplot(logistic_training, aes(x=training$age, y=training$over_50k))+geom_line() 
+
+
+
+