/**
* Metoda zwraca najczêœciej udzielan¹ odpowiedŸ dla wybranego pytania, które pochodzi z pewnego
* rodzaju ankiety.
*
* @param surveys
* @param questionNumber
* @return
*/
public float getMode(List<Survey> surveys, int questionNumber) {
float mode = 0;
int answer = 0;
HashMap<Integer, Integer> mapa = new HashMap<Integer, Integer>();
for (Survey survey : surveys) {
if (survey.isFinished() && survey.getQuestion(questionNumber).isAnswered()) {
int typeQuestion = survey.getQuestion(questionNumber).getQuestionType();
if (typeQuestion == 5) {
ScaleQuestion quest = (ScaleQuestion) survey.getQuestion(questionNumber);
if (mapa.containsKey(quest.getUserAnswer())) {
mapa.put(quest.getUserAnswer(), mapa.get(quest.getUserAnswer()) + 1);
} else {
mapa.put(quest.getUserAnswer(), 1);
}
}
}
}
for (HashMap.Entry<Integer, Integer> entr : mapa.entrySet()) {
if (mode < entr.getValue()) {
mode = entr.getValue();
answer = entr.getKey();
}
}
return answer;
}
/**
* Metoda zwraca maksymaln¹ otrzyman¹ odpowiedŸ dla pytania skala pochodz¹cego z jakiegoœ rodzaju
* ankiet.
*
* @param surveys
* @param questionNumber
* @return
*/
public float getMaxValue(List<Survey> surveys, int questionNumber) {
float max = 0;
List<Integer> lista = new ArrayList<Integer>();
for (Survey survey : surveys) {
if (survey.isFinished()) {
int typeQuestion = survey.getQuestion(questionNumber).getQuestionType();
if (typeQuestion == 5) {
if (survey.getQuestion(questionNumber).isAnswered()) {
ScaleQuestion quest = (ScaleQuestion) survey.getQuestion(questionNumber);
lista.add(quest.getUserAnswer());
}
}
}
}
Collections.sort(lista);
max = lista.get(lista.size() - 1);
return max;
}
/**
* Metoda zwraca medianê dla wybranego pytania typu skala dla konkretego rodzaju ankiety.
*
* @param surveys
* @param questionNumber
* @return
*/
public float getMedian(List<Survey> surveys, int questionNumber) {
float median;
List<Integer> lista = new ArrayList<Integer>();
for (Survey survey : surveys) {
if (survey.isFinished() && survey.getQuestion(questionNumber).isAnswered()) {
int typeQuestion = survey.getQuestion(questionNumber).getQuestionType();
if (typeQuestion == 5) {
ScaleQuestion quest = (ScaleQuestion) survey.getQuestion(questionNumber);
lista.add(quest.getUserAnswer());
}
}
}
Collections.sort(lista);
int middle = lista.size() / 2;
if (lista.size() % 2 == 1) {
median = lista.get(middle);
} else {
median = (float) ((lista.get(middle - 1) + lista.get(middle)) / 2.0);
}
return median;
}
/**
* Metoda zwraca odchylenie standardowe dla wybranego pytania z konkretego rodzaju ankiety.
*
* @param surveys
* @param questionNumber
* @return
*/
public double getStandardDeviation(List<Survey> surveys, int questionNumber) {
int answers = 0;
float variance = 0;
double mean = getMean(surveys, questionNumber);
for (Survey survey : surveys) {
if (survey.isFinished() && survey.getQuestion(questionNumber).isAnswered()) {
int typeQuestion = survey.getQuestion(questionNumber).getQuestionType();
if (typeQuestion == 5) {
ScaleQuestion quest = (ScaleQuestion) survey.getQuestion(questionNumber);
variance += Math.pow((quest.getUserAnswer() - mean), 2);
answers += 1;
}
}
}
double standardDeviation;
if (answers != 0) {
standardDeviation = Math.sqrt(variance / answers);
} else {
standardDeviation = -1;
}
return standardDeviation;
}
/**
* Metoda zwraca œredni¹ dla wybranego pytania z pewnego rodzaju ankiety.
*
* @param surveys
* @param question
* @return
*/
public double getMean(
List<Survey> surveys, Question question) { // pamiêtaj o indeksowaniu pytañ w survey
float sum = 0;
int answers = 0; // liczba odpowiedzi na wybrane pytanie
for (Survey survey : surveys) {
if (survey.isFinished()
&& survey.getQuestion(survey.indexOfQuestion(question)).isAnswered()) {
int numberOfQuestion = survey.indexOfQuestion(question);
int typeQuestion = survey.getQuestion(numberOfQuestion).getQuestionType();
if (typeQuestion == 5) {
ScaleQuestion quest = (ScaleQuestion) survey.getQuestion(numberOfQuestion);
sum += quest.getUserAnswer();
answers += 1;
}
}
}
if (answers != 0) {
return (double) sum / answers;
} else {
return -1;
}
}
/**
* Metoda zwraca œredni¹ dla pewnego numeru pytania, które pochodzi z wybranego rodzaju ankiety.
*
* @param surveys
* @param number
* @return
*/
public double getMean(
List<Survey> surveys, int number) { // pamiêtaj o indeksowaniu pytañ w survey
float sum = 0;
int answers = 0; // liczba odpowiedzi na wybrane pytanie
for (Survey survey : surveys) {
if (survey.isFinished() && survey.getQuestion(number).isAnswered()) {
int typeQuestion = survey.getQuestion(number).getQuestionType();
// System.out.println("Typ pytania " + typeQuestion);
if (typeQuestion == 5) {
ScaleQuestion question = (ScaleQuestion) survey.getQuestion(number);
// System.out.println("OdpowiedŸ: " + question.getUserAnswer());
sum += question.getUserAnswer();
answers += 1;
}
}
}
if (answers != 0) {
// System.out.println("Suma i liczba odpowiedzi " + sum +" "+answers);
return (double) sum / answers;
} else {
return 0;
}
}