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Fix statistics calculation for imported Likert scale responses and support text rating answers

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pongpon pitisuk
2026-09-12 16:11:27 +07:00
parent fb5b4b4c95
commit a68bddb5c0
4 changed files with 217 additions and 39 deletions
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api/statistics.php
+76 -15
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@@ -28,6 +28,44 @@ if (!isAdmin()) {
}
}
/**
* Helper to parse Likert rating values from numbers or Thai text
*/
function parseRatingScore($str) {
$trimmed = trim((string)$str);
if ($trimmed === '') return null;
if (is_numeric($trimmed)) {
$num = (int)$trimmed;
return ($num >= 1 && $num <= 5) ? $num : null;
}
if (preg_match('/^([1-5])\s*[\.\:\-\(\s]/u', $trimmed, $m)) {
return (int)$m[1];
}
if (mb_strpos($trimmed, 'มากที่สุด') !== false || mb_strpos($trimmed, 'ดีมาก') !== false || mb_strpos($trimmed, 'ยอดเยี่ยม') !== false || mb_strpos($trimmed, 'ดีเยี่ยม') !== false || mb_strpos($trimmed, 'เห็นด้วยอย่างยิ่ง') !== false) {
return 5;
}
if (mb_strpos($trimmed, 'น้อยที่สุด') !== false || mb_strpos($trimmed, 'ไม่เห็นด้วยอย่างยิ่ง') !== false) {
return 1;
}
if (mb_strpos($trimmed, 'มาก') !== false || mb_strpos($trimmed, 'ดี') !== false || mb_strpos($trimmed, 'เห็นด้วย') !== false) {
return 4;
}
if (mb_strpos($trimmed, 'ปานกลาง') !== false || mb_strpos($trimmed, 'พอใช้') !== false || mb_strpos($trimmed, 'ไม่แน่ใจ') !== false) {
return 3;
}
if (mb_strpos($trimmed, 'น้อย') !== false || mb_strpos($trimmed, 'ควรปรับปรุง') !== false || mb_strpos($trimmed, 'ต้องปรับปรุง') !== false || mb_strpos($trimmed, 'ไม่เห็นด้วย') !== false) {
return 2;
}
if (mb_strpos($trimmed, 'ปรับปรุง') !== false) {
return 1;
}
return null;
}
switch ($action) {
case 'summary':
getSummary($surveyId);
@@ -52,24 +90,44 @@ function getSummary($surveyId) {
$stmt->execute([$surveyId]);
$surveyInfo = $stmt->fetch();
// Get overall mean and SD for radio/rating questions
// Fetch all answers for rating questions in this survey and compute mean/sd
$stmt = $db->prepare("
SELECT
AVG(CAST(ra.answer_value AS DECIMAL(10,2))) as overall_mean,
STDDEV(CAST(ra.answer_value AS DECIMAL(10,2))) as overall_sd
SELECT ra.answer_value
FROM response_answers ra
JOIN survey_questions sq ON ra.question_id = sq.id
JOIN survey_sections ss ON sq.section_id = ss.id
WHERE ss.survey_id = ? AND sq.question_type = 'radio' AND sq.options IS NULL AND ra.answer_value REGEXP '^[0-9]+$'
WHERE ss.survey_id = ? AND sq.question_type = 'radio' AND sq.options IS NULL
");
$stmt->execute([$surveyId]);
$overall = $stmt->fetch();
$rows = $stmt->fetchAll(PDO::FETCH_COLUMN);
$scores = [];
foreach ($rows as $ans) {
$sc = parseRatingScore($ans);
if ($sc !== null) {
$scores[] = $sc;
}
}
$overallMean = 0;
$overallSd = 0;
if (count($scores) > 0) {
$overallMean = array_sum($scores) / count($scores);
if (count($scores) > 1) {
$sumSq = 0;
foreach ($scores as $s) {
$sumSq += pow($s - $overallMean, 2);
}
$overallSd = sqrt($sumSq / (count($scores) - 1));
}
}
jsonResponse([
'survey' => $surveyInfo,
'total_responses' => (int)$total,
'overall_mean' => $overall['overall_mean'] ? round((float)$overall['overall_mean'], 2) : 0,
'overall_sd' => $overall['overall_sd'] ? round((float)$overall['overall_sd'], 2) : 0
'overall_mean' => round($overallMean, 2),
'overall_sd' => round($overallSd, 2)
]);
}
@@ -114,11 +172,11 @@ function getDetail($surveyId) {
];
if ($q['question_type'] === 'radio' && empty($q['options'])) {
// Calculate mean, SD, frequency for rating questions (1-5)
// Rating scale question (1-5)
$aStmt = $db->prepare("
SELECT answer_value, COUNT(*) as cnt
FROM response_answers
WHERE question_id = ? AND answer_value REGEXP '^[0-9]+$'
WHERE question_id = ? AND answer_value != ''
GROUP BY answer_value
ORDER BY answer_value
");
@@ -134,11 +192,14 @@ function getDetail($surveyId) {
}
foreach ($freqData as $fd) {
$val = (int)$fd['answer_value'];
$rawVal = trim($fd['answer_value']);
$cnt = (int)$fd['cnt'];
$val = parseRatingScore($rawVal);
if ($val >= 1 && $val <= 5) {
$frequencies[$val]['count'] = (int)$fd['cnt'];
$totalAnswers += (int)$fd['cnt'];
for ($j = 0; $j < (int)$fd['cnt']; $j++) {
$frequencies[$val]['count'] += $cnt;
$totalAnswers += $cnt;
for ($j = 0; $j < $cnt; $j++) {
$values[] = $val;
}
}
@@ -193,7 +254,7 @@ function getDetail($surveyId) {
$aStmt = $db->prepare("
SELECT answer_value, COUNT(*) as cnt
FROM response_answers
WHERE question_id = ?
WHERE question_id = ? AND answer_value != ''
GROUP BY answer_value
ORDER BY cnt DESC
");